math/rand: warn against using package for security-sensitive work
math/rand: warn against using package for security-sensitive work

Urge users of math/rand to consider using crypto/rand when doing
security-sensitive work.

Related to issue #11871. While we haven't reached consensus on how
to make the package inherently safer, everyone agrees that the docs
for math/rand can be improved.

Change-Id: I576a312e51b2a3445691da6b277c7b4717173197
Reviewed-on: https://go-review.googlesource.com/12900
Reviewed-by: Rob Pike <4dc7c9ec434ed06502767136789763ec11d2c4b7@golang.org>

Badredapple/go,snowsnail/go,binarycrusader/go,skotti/go,slavau/go,momchil-velikov/go,albertjin/golang-go,undergrowthlinear/go,famorted/go,snowsnail/go,cookerzhu/go,jonathanmarvens/go,alex-zhang/go,sinuos/go,cainiaocome/go,jefby/go,vishsingh/go,NichoZhang/go,fjballest/golang,jasonxiong/go,ericsnowcurrently/go,jonathanmarvens/go,akutz/go,4ad/go,danielsoro/go,odeke-em/go,parkdy/go,baiyunping333/go,snowsnail/go,uileyar/go,andrewchambers/go,zhangg/go,xiaobodu/go,CAFxX/go,skatsuta/go,Stan-Lin-/go,vsdutka/go,cloudflare/go,jefby/go,myPublicGit/go,theass/go,lihuanghai/go,xujianhai/go,arschles/golang-go,greyhwndz/go,yuhengye/go,CAFxX/go,stormltf/go,stormltf/go,arschles/golang-go,danielsoro/go,dpatel06/go,danycoro/go,beealone/go,jameskumar/go,yangzhongj/go,miolini/go,AALEKH/go,josharian/go,NichoZhang/go,theif519/go,CarterTsai/go,vishsingh/go,kevinc0825/go,sosop/go,jacobxk/go,jasonxiong/go,golang/go,Samurais/go,qskycolor/go,sinuos/go,jdeng/go,constantine001/go,NunoEdgarGub1/go,Charlesdong/go-1,greyhwndz/go,likesea/go,akutz/go,chinanjjohn2012/go,jonathanmarvens/go,kim-racktop/go,codestation/go,derekmarcotte/go,willjunspecial/go,Jordanzuo/go,WIZARD-CXY/go,CarterTsai/go,CiscoCloud/go,monetate/go,vishsingh/go,qskycolor/go,Cofyc/go,sinuos/go,derekmarcotte/go,cyberroadie/go,zouchao2010/go,danycoro/go,zcwfeng/go,xujianhai/go,leeric92/go,yasarkunduz/go,jonasi/go,cloudflare/go,ichu501/go,jdhenke/go,mwhudson/go,cyberroadie/go,zcwfeng/go,Stan-Lin-/go,dafyddcrosby/go,nakedgc/go,jameskumar/go,shines77/go,sndnvaps/go,AALEKH/go,likesea/go,theif519/go,linux-on-ibm-z/go,polyverse-security/go,danielsoro/go,ObjectiveJoe/go,rachtsingh/gogojuice,xujianhai/go,arschles/golang-go,danycoro/go,Samurais/go,vsdutka/go,ericsnowcurrently/go,Pulgafree/go,mwhudson/go,honsiorovskyi/go,arschles/golang-go,goodlang/good,snowsnail/go,fjballest/golang,derekmarcotte/go,binarycrusader/go,jonasi/go,NichoZhang/go,kakuhiroshi/go,polyverse-security/go,sndnvaps/go,dterei/go,gdey/go,springning/go,arschles/go-1,NichoZhang/go,deft-code/go,alash3al/go,akutz/go,ObjectiveJoe/go,vsekhar/elastic-go,odeke-em/go,jonasi/go,Jordanzuo/go,albertjin/golang-go,golang/go,JioCloud/go,Young55555/go,skotti/go,mgyenik/go,gdey/go,wangfakang/go-1,xiaobodu/go,greyhwndz/go,jmptrader/go,constantine001/go,devpadawan/go,alex-zhang/go,undergrowthlinear/go,jacobxk/go,shines77/go,Badredapple/go,4ad/go,NichoZhang/go,danielsoro/go,gdey/go,codestation/go,samanalysis/go,jonahglover/go,dafyddcrosby/go,ObjectiveJoe/go,Endika/go,zouchao2010/go,rachtsingh/gogojuice,myPublicGit/go,jacobhaven/go,GeorgiCodes/go,mgyenik/go,ErikDubbelboer/go,donnel6809/go,xiuzhifu/go,jonasi/go,rachtsingh/gogojuice,miolini/go,youprofit/go,arschles/golang-go,yasarkunduz/go,qskycolor/go,Jordanzuo/go,mikekap/go,akutz/go,sosop/go,xiuzhifu/go,slavau/go,vanloswang/go,mikekap/go,jasonxiong/go,binarycrusader/go,sosop/go,zhangg/go,greyhwndz/go,mwhudson/go,akutz/go,derekmarcotte/go,cyberroadie/go,sndnvaps/go,sosop/go,kakuhiroshi/go,jefby/go,Jordanzuo/go,jdhenke/go,stormltf/go,4ad/go,leeric92/go,Charlesdong/go-1,danycoro/go,uileyar/go,cloudflare/go,polyverse-security/go,monetate/go,honsiorovskyi/go,golang/go,vanloswang/go,odeke-em/go,vsekhar/elastic-go,kevinc0825/go,jameskumar/go,xiaobodu/go,cloudflare/go,monetate/go,roth1002/go,sndnvaps/go,mwhudson/go,vanloswang/go,linux-on-ibm-z/go,JioCloud/go,cyberroadie/go,mdp/go,xiaobodu/go,kakuhiroshi/go,Pulgafree/go,jacobxk/go,roth1002/go,mdp/go,greyhwndz/go,joshsammut/go,polyverse-security/go,yangzhongj/go,kim-racktop/go,leeric92/go,Samurais/go,ImJasonH/go,parkdy/go,NunoEdgarGub1/go,b54898533/go,cainiaocome/go,polyverse-security/go,slavau/go,nakedgc/go,devpadawan/go,cookerzhu/go,vanloswang/go,dpatel06/go,skotti/go,vishsingh/go,roth1002/go,willjunspecial/go,roth1002/go,kim-racktop/go,odeke-em/go,lihuanghai/go,uileyar/go,kim-racktop/go,honsiorovskyi/go,devpadawan/go,CiscoCloud/go,cainiaocome/go,honsiorovskyi/go,shines77/go,famorted/go,Young55555/go,deft-code/go,uileyar/go,jacobhaven/go,linux-on-ibm-z/go,alex-zhang/go,nakedgc/go,theif519/go,Badredapple/go,donnel6809/go,CodyGuo/go,jacobhaven/go,NunoEdgarGub1/go,zhangg/go,undergrowthlinear/go,jacobsa/go,jefby/go,alex-zhang/go,constantine001/go,kevinc0825/go,jasonxiong/go,arschles/golang-go,jdhenke/go,dpatel06/go,yangzhongj/go,jacobxk/go,famorted/go,mbrukman/go,Pulgafree/go,youprofit/go,NichoZhang/go,andrewchambers/go,vishsingh/go,mdp/go,springning/go,jacobsa/go,AALEKH/go,springning/go,yuhengye/go,wangfakang/go-1,undergrowthlinear/go,yasarkunduz/go,cloudflare/go,zouchao2010/go,momchil-velikov/go,likesea/go,dpatel06/go,rentongzhang/go,Badredapple/go,leeric92/go,sndnvaps/go,sndnvaps/go,Samurais/go,likesea/go,Endika/go,albertjin/golang-go,kevinc0825/go,arschles/go-1,yangzhongj/go,malvira/go,jameskumar/go,binarycrusader/go,ganboing/go-esx,suncycheng/go,ichu501/go,yuhengye/go,josharian/go,ichu501/go,Charlesdong/go-1,mwhudson/go,christopher-henderson/Go,donnel6809/go,josharian/go,devpadawan/go,fjballest/golang,xiaobodu/go,skotti/go,cloudflare/go,danielsoro/go,zhangg/go,rachtsingh/gogojuice,CAFxX/go,alex-zhang/go,Young55555/go,Jordanzuo/go,josharian/go,theif519/go,cainiaocome/go,mgyenik/go,ImJasonH/go,xiaobodu/go,fjballest/golang,chinanjjohn2012/go,albertjin/golang-go,CiscoCloud/go,jonasi/go,devpadawan/go,CarterTsai/go,joshsammut/go,samanalysis/go,jonahglover/go,myPublicGit/go,willjunspecial/go,constantine001/go,ganboing/go-esx,XuYunnan/go,zouchao2010/go,alash3al/go,AALEKH/go,ichu501/go,dafyddcrosby/go,jameskumar/go,mdp/go,CAFxX/go,constantine001/go,lihuanghai/go,slavau/go,baiyunping333/go,ErikDubbelboer/go,skotti/go,myPublicGit/go,momchil-velikov/go,zouchao2010/go,ImJasonH/go,slavau/go,undergrowthlinear/go,wangfakang/go-1,xiuzhifu/go,CiscoCloud/go,yasarkunduz/go,alash3al/go,mwhudson/go,famorted/go,XuYunnan/go,ganboing/go-esx,suncycheng/go,NunoEdgarGub1/go,miolini/go,jdhenke/go,youprofit/go,chinanjjohn2012/go,cyberroadie/go,andrewchambers/go,josharian/go,roth1002/go,nawawi/go,vishsingh/go,dafyddcrosby/go,rentongzhang/go,constantine001/go,Cofyc/go,kakuhiroshi/go,cyberroadie/go,joshsammut/go,mdp/go,theass/go,jefby/go,cainiaocome/go,zcwfeng/go,zcwfeng/go,CiscoCloud/go,jacobhaven/go,yasarkunduz/go,codestation/go,dpatel06/go,albertjin/golang-go,goodlang/good,baiyunping333/go,arschles/go-1,chinanjjohn2012/go,ObjectiveJoe/go,Stan-Lin-/go,danycoro/go,skotti/go,mikekap/go,xujianhai/go,jdeng/go,chinanjjohn2012/go,XuYunnan/go,sinuos/go,shines77/go,honsiorovskyi/go,Samurais/go,Pulgafree/go,NichoZhang/go,jmptrader/go,dafyddcrosby/go,mbrukman/go,donnel6809/go,gdey/go,jmptrader/go,mdp/go,CAFxX/go,honsiorovskyi/go,arschles/golang-go,jdeng/go,beealone/go,dterei/go,stormltf/go,codestation/go,arschles/go-1,cainiaocome/go,AALEKH/go,XuYunnan/go,youprofit/go,springning/go,jdeng/go,nakedgc/go,jonasi/go,joshsammut/go,zcwfeng/go,Stan-Lin-/go,famorted/go,malvira/go,alash3al/go,ichu501/go,dpatel06/go,goodlang/good,cloudflare/go,joshsammut/go,rentongzhang/go,binarycrusader/go,parkdy/go,stormltf/go,samanalysis/go,lihuanghai/go,golang/go,CarterTsai/go,jdhenke/go,zhangg/go,kakuhiroshi/go,CiscoCloud/go,skatsuta/go,wangfakang/go-1,cyberroadie/go,stormltf/go,mgyenik/go,4ad/go,jefby/go,GeorgiCodes/go,sosop/go,ErikDubbelboer/go,jacobxk/go,golang/go,alash3al/go,constantine001/go,dterei/go,rentongzhang/go,codestation/go,mgyenik/go,xiuzhifu/go,zouchao2010/go,alex-zhang/go,g522342435/go,CAFxX/go,Samurais/go,honsiorovskyi/go,vanloswang/go,ImJasonH/go,theif519/go,ichu501/go,yasarkunduz/go,CodyGuo/go,danycoro/go,jonahglover/go,polyverse-security/go,gdey/go,skatsuta/go,myPublicGit/go,wangfakang/go-1,theass/go,g522342435/go,goodlang/good,jonasi/go,mdp/go,jefby/go,WIZARD-CXY/go,Cofyc/go,cainiaocome/go,odeke-em/go,wangfakang/go-1,snowsnail/go,ifagnosticism/go,nawawi/go,slavau/go,vsekhar/elastic-go,goodlang/good,rentongzhang/go,dpatel06/go,deft-code/go,likesea/go,vsekhar/elastic-go,Cofyc/go,cookerzhu/go,likesea/go,beealone/go,ImJasonH/go,mbrukman/go,cloudflare/go,odeke-em/go,Jordanzuo/go,kakuhiroshi/go,kakuhiroshi/go,samanalysis/go,xiuzhifu/go,andrewchambers/go,Endika/go,Young55555/go,skatsuta/go,rachtsingh/gogojuice,skatsuta/go,momchil-velikov/go,joshsammut/go,xujianhai/go,nawawi/go,ErikDubbelboer/go,sndnvaps/go,willjunspecial/go,4ad/go,deft-code/go,alash3al/go,GeorgiCodes/go,momchil-velikov/go,ganboing/go-esx,jacobxk/go,WIZARD-CXY/go,rachtsingh/gogojuice,NunoEdgarGub1/go,vsekhar/elastic-go,akutz/go,CAFxX/go,donnel6809/go,Samurais/go,ifagnosticism/go,Badredapple/go,mikekap/go,jacobhaven/go,yangzhongj/go,skotti/go,Endika/go,xiuzhifu/go,parkdy/go,ganboing/go-esx,parkdy/go,jdhenke/go,Cofyc/go,andrewchambers/go,leeric92/go,alash3al/go,yuhengye/go,malvira/go,youprofit/go,uileyar/go,ImJasonH/go,momchil-velikov/go,xujianhai/go,ericsnowcurrently/go,CAFxX/go,rentongzhang/go,cookerzhu/go,youprofit/go,jdeng/go,ericsnowcurrently/go,slavau/go,XuYunnan/go,donnel6809/go,qskycolor/go,mikekap/go,vsdutka/go,dafyddcrosby/go,arschles/go-1,derekmarcotte/go,malvira/go,linux-on-ibm-z/go,alash3al/go,wangfakang/go-1,Pulgafree/go,ifagnosticism/go,WIZARD-CXY/go,CodyGuo/go,cookerzhu/go,alex-zhang/go,sinuos/go,jdhenke/go,Charlesdong/go-1,zouchao2010/go,rachtsingh/gogojuice,jonathanmarvens/go,lihuanghai/go,lihuanghai/go,ifagnosticism/go,fjballest/golang,GeorgiCodes/go,wangfakang/go-1,linux-on-ibm-z/go,dterei/go,NichoZhang/go,b54898533/go,willjunspecial/go,vishsingh/go,AALEKH/go,CarterTsai/go,WIZARD-CXY/go,kim-racktop/go,albertjin/golang-go,sinuos/go,cookerzhu/go,xujianhai/go,jonahglover/go,monetate/go,Badredapple/go,jacobsa/go,NunoEdgarGub1/go,baiyunping333/go,undergrowthlinear/go,miolini/go,undergrowthlinear/go,shines77/go,skatsuta/go,leeric92/go,WIZARD-CXY/go,yangzhongj/go,AALEKH/go,monetate/go,ErikDubbelboer/go,jasonxiong/go,vsdutka/go,nakedgc/go,Jordanzuo/go,yasarkunduz/go,jasonxiong/go,devpadawan/go,jacobsa/go,suncycheng/go,dterei/go,yangzhongj/go,CarterTsai/go,kevinc0825/go,shines77/go,CodyGuo/go,willjunspecial/go,springning/go,ObjectiveJoe/go,mbrukman/go,linux-on-ibm-z/go,undergrowthlinear/go,jasonxiong/go,akutz/go,jasonxiong/go,danielsoro/go,jonathanmarvens/go,polyverse-security/go,cookerzhu/go,jmptrader/go,springning/go,danycoro/go,deft-code/go,Pulgafree/go,akutz/go,yasarkunduz/go,uileyar/go,g522342435/go,Endika/go,linux-on-ibm-z/go,XuYunnan/go,likesea/go,mikekap/go,AALEKH/go,dafyddcrosby/go,Cofyc/go,jameskumar/go,samanalysis/go,cyberroadie/go,mgyenik/go,fjballest/golang,binarycrusader/go,CodyGuo/go,golang/go,nawawi/go,suncycheng/go,JioCloud/go,malvira/go,jacobxk/go,uileyar/go,famorted/go,skatsuta/go,jonahglover/go,WIZARD-CXY/go,yangzhongj/go,constantine001/go,chinanjjohn2012/go,b54898533/go,youprofit/go,samanalysis/go,beealone/go,ImJasonH/go,samanalysis/go,theass/go,honsiorovskyi/go,qskycolor/go,skotti/go,suncycheng/go,ObjectiveJoe/go,GeorgiCodes/go,qskycolor/go,albertjin/golang-go,danielsoro/go,ErikDubbelboer/go,jameskumar/go,zhangg/go,theass/go,fjballest/golang,nawawi/go,qskycolor/go,sndnvaps/go,golang/go,mdp/go,mgyenik/go,ericsnowcurrently/go,jmptrader/go,yuhengye/go,andrewchambers/go,rachtsingh/gogojuice,andrewchambers/go,vanloswang/go,Endika/go,xiaobodu/go,GeorgiCodes/go,willjunspecial/go,devpadawan/go,nakedgc/go,goodlang/good,xiuzhifu/go,ericsnowcurrently/go,jdeng/go,jdeng/go,derekmarcotte/go,Charlesdong/go-1,Badredapple/go,polyverse-security/go,baiyunping333/go,cainiaocome/go,GeorgiCodes/go,CiscoCloud/go,Endika/go,shines77/go,Young55555/go,jacobsa/go,chinanjjohn2012/go,Stan-Lin-/go,dterei/go,CodyGuo/go,xiuzhifu/go,odeke-em/go,qskycolor/go,donnel6809/go,miolini/go,deft-code/go,vsdutka/go,ichu501/go,theass/go,sosop/go,deft-code/go,slavau/go,CodyGuo/go,g522342435/go,nawawi/go,mbrukman/go,vsdutka/go,ifagnosticism/go,ifagnosticism/go,roth1002/go,famorted/go,kim-racktop/go,NunoEdgarGub1/go,yuhengye/go,kim-racktop/go,lihuanghai/go,Young55555/go,parkdy/go,parkdy/go,ObjectiveJoe/go,JioCloud/go,ganboing/go-esx,g522342435/go,b54898533/go,NunoEdgarGub1/go,arschles/golang-go,greyhwndz/go,kevinc0825/go,vishsingh/go,b54898533/go,beealone/go,4ad/go,WIZARD-CXY/go,vanloswang/go,vanloswang/go,theif519/go,leeric92/go,Cofyc/go,b54898533/go,xiaobodu/go,4ad/go,vsdutka/go,Charlesdong/go-1,zhangg/go,XuYunnan/go,Pulgafree/go,parkdy/go,JioCloud/go,binarycrusader/go,CodyGuo/go,Young55555/go,kakuhiroshi/go,nakedgc/go,jonahglover/go,binarycrusader/go,mikekap/go,dterei/go,Stan-Lin-/go,samanalysis/go,codestation/go,jacobsa/go,jacobxk/go,derekmarcotte/go,gdey/go,linux-on-ibm-z/go,arschles/go-1,g522342435/go,b54898533/go,ImJasonH/go,miolini/go,malvira/go,vsekhar/elastic-go,vsdutka/go,josharian/go,codestation/go,ErikDubbelboer/go,ericsnowcurrently/go,rentongzhang/go,yuhengye/go,jacobhaven/go,sosop/go,beealone/go,g522342435/go,theif519/go,theass/go,vsekhar/elastic-go,chinanjjohn2012/go,devpadawan/go,roth1002/go,Endika/go,stormltf/go,jdeng/go,snowsnail/go,zcwfeng/go,rentongzhang/go,leeric92/go,xujianhai/go,joshsammut/go,willjunspecial/go,famorted/go,monetate/go,youprofit/go,ganboing/go-esx,Pulgafree/go,jdhenke/go,mwhudson/go,baiyunping333/go,zhangg/go,likesea/go,jonathanmarvens/go,mikekap/go,dpatel06/go,Stan-Lin-/go,suncycheng/go,mwhudson/go,ErikDubbelboer/go,gdey/go,kevinc0825/go,momchil-velikov/go,jonathanmarvens/go,Samurais/go,jacobhaven/go,theass/go,myPublicGit/go,Young55555/go,andrewchambers/go,4ad/go,uileyar/go,jmptrader/go,fjballest/golang,cookerzhu/go,greyhwndz/go,sinuos/go,stormltf/go,josharian/go,springning/go,myPublicGit/go,JioCloud/go,ObjectiveJoe/go,jmptrader/go,snowsnail/go,sosop/go,gdey/go,mgyenik/go,deft-code/go,Cofyc/go,nawawi/go,suncycheng/go,nakedgc/go,beealone/go,momchil-velikov/go,danycoro/go,odeke-em/go,codestation/go,arschles/go-1,snowsnail/go,kim-racktop/go,jacobsa/go,albertjin/golang-go,jameskumar/go,shines77/go,ichu501/go,joshsammut/go,g522342435/go,ericsnowcurrently/go,Stan-Lin-/go,roth1002/go,mbrukman/go,CarterTsai/go,alex-zhang/go,malvira/go,monetate/go,lihuanghai/go,ifagnosticism/go,arschles/go-1,mbrukman/go,theif519/go,springning/go,myPublicGit/go,GeorgiCodes/go,josharian/go,jefby/go,sinuos/go,CiscoCloud/go,jonahglover/go,beealone/go,ifagnosticism/go,miolini/go,ganboing/go-esx,golang/go,goodlang/good,mbrukman/go,jacobsa/go,CarterTsai/go,jacobhaven/go,dafyddcrosby/go,jonasi/go,derekmarcotte/go,skatsuta/go,kevinc0825/go,jmptrader/go,malvira/go,nawawi/go,JioCloud/go,Jordanzuo/go,monetate/go,miolini/go,Charlesdong/go-1,goodlang/good,jonahglover/go,yuhengye/go,zcwfeng/go,suncycheng/go,donnel6809/go,danielsoro/go,Charlesdong/go-1,greyhwndz/go,b54898533/go,baiyunping333/go,XuYunnan/go,baiyunping333/go,JioCloud/go,zcwfeng/go,Badredapple/go,vsekhar/elastic-go,jonathanmarvens/go,zouchao2010/go,dterei/go