loopback: use IoctlGetInt/IoctlSetInt from x/sys/unix
loopback: use IoctlGetInt/IoctlSetInt from x/sys/unix

Use IoctlGetInt/IoctlSetInt from golang.org/x/sys/unix (where
applicable) instead of manually reimplementing them.

Signed-off-by: Tobias Klauser <9249c549618448e4c699e8032ba6c7f0d7fd4b7f@distanz.ch>

jthelin/docker,trebonian/docker,cpuguy83/docker,konstruktoid/docker-1,amatsus/docker,ibuildthecloud/docker,AkihiroSuda/docker,noironetworks/docker,jimjag/docker,moul/docker,moby/moby,scotttlin/docker,unclejack/docker,duglin/docker,mkumatag/docker,Ramzec/docker,dsheets/moby,vdemeester/docker,mkumatag/docker,laijs/docker,scotttlin/docker,dims/docker,gnailuy/docker,djs55/docker,paralin/docker,kojiromike/docker,moby/moby,bearstech/moby,thaJeztah/docker,kolyshkin/docker,liaoqingwei/docker,yosifkit/docker,Mokolea/docker,djs55/docker,jwhonce/docker,amatsus/docker,rremer/moby,cpuguy83/docker,kojiromike/docker,kolyshkin/moby,jwhonce/docker,dccurtis/docker,paralin/docker,nalind/docker,tmp6154/docker,laijs/docker,SvenDowideit/docker,YuPengZTE/docker,vdemeester/docker,unclejack/docker,miminar/docker,tophj-ibm/docker,justincormack/docker,Ramzec/docker,jvanz/docker,haveatry/docker,tklauser/docker,danyalKhaliq10p/moby,mahak/docker,nawawi/docker,kolyshkin/moby,coolljt0725/docker,bearstech/moby,cyphar/docker,cyphar/docker,maxamillion/docker,liaoqingwei/docker,dmcgowan/docker,mikebrow/docker,jvanz/docker,ndeloof/docker,trebonian/docker,jameszhan/docker,sterchelen/docker,SvenDowideit/docker,djs55/docker,AkihiroSuda/docker,jimjag/docker,konstruktoid/docker-1,x1022as/docker,dmcgowan/docker,noironetworks/docker,dccurtis/docker,kolyshkin/docker,raja-sami-10p/moby,dccurtis/docker,mikebrow/docker,cpuguy83/docker,jvanz/docker,naveed-jamil-tenpearls/moby,johnstep/moby-moby,x1022as/docker,whuwxl/docker,allencloud/docker,moby/moby,jimjag/docker,rancher/docker,rremer/moby,thaJeztah/docker,rhatdan/docker,jameszhan/docker,mahak/docker,ndeloof/docker,shishir-a412ed/docker,docker/docker,moul/docker,ripcurld0/moby,noironetworks/docker,pramodhkp/moby,mike1729/docker,ibuildthecloud/docker,Ramzec/docker,yosifkit/docker,x1022as/docker,jlhawn/docker,laijs/docker,mahak/docker,jthelin/docker,cpuguy83/docker,mikebrow/docker,whuwxl/docker,Mokolea/docker,pradipd/moby,allencloud/docker,mike1729/docker,trebonian/docker,tonistiigi/docker,mixja/docker,coreos/docker,yongtang/docker,tophj-ibm/moby,gnailuy/docker,YuPengZTE/docker,haveatry/docker,jameszhan/docker,ibuildthecloud/docker,justincormack/docker,dims/docker,docker/docker,trebonian/docker,duglin/docker,estesp/docker,naveed-jamil-tenpearls/moby,KarthikNayak/docker,Mokolea/docker,ibuildthecloud/docker,rhatdan/docker,dsheets/moby,raja-sami-10p/moby,laijs/moby,naveed-jamil-tenpearls/moby,nalind/docker,nawawi/docker,tklauser/docker,estesp/docker,paralin/docker,madhanrm/docker,danyalKhaliq10p/moby,pradipd/moby,AkihiroSuda/docker,crosbymichael/docker,flavio/docker,yongtang/docker,paralin/docker,estesp/docker,bearstech/moby,madhanrm/docker,rancher/docker,tophj-ibm/docker,johnstep/moby-moby,raja-sami-10p/moby,PatrickLang/moby,jlhawn/docker,jlhawn/docker,laijs/moby,docker/docker,yummypeng/docker,coreos/docker,jimjag/docker,maxamillion/docker,srust/docker,konstruktoid/docker-1,shishir-a412ed/docker,cyphar/docker,nalind/docker,gnailuy/docker,KarthikNayak/docker,maxamillion/docker,miminar/docker,vdemeester/docker,pradipd/moby,sterchelen/docker,fcrisciani/docker,gnailuy/docker,amatsus/docker,ibuildthecloud/docker,laijs/moby,dsheets/moby,madhanrm/docker,srust/docker,unclejack/docker,thaJeztah/docker,duglin/docker,sterchelen/docker,mkumatag/docker,mahak/docker,ndeloof/docker,kolyshkin/moby,justincormack/docker,crosbymichael/docker,tklauser/docker,bearstech/moby,hqhq/moby,flavio/docker,konstruktoid/docker-upstream,konstruktoid/docker-upstream,mixja/docker,rremer/moby,yosifkit/docker,crosbymichael/docker,konstruktoid/docker-upstream,pramodhkp/moby,tonistiigi/docker,KingEmet/docker,yongtang/docker,Mokolea/docker,scotttlin/docker,kojiromike/docker,konstruktoid/docker-upstream,flavio/docker,moby/moby,yummypeng/docker,fcrisciani/docker,nawawi/docker,mike1729/docker,YuPengZTE/docker,hqhq/moby,tophj-ibm/docker,thaJeztah/docker,flavio/docker,whuwxl/docker,coolljt0725/docker,KarthikNayak/docker,jwhonce/docker,tophj-ibm/moby,PatrickLang/moby,AkihiroSuda/docker,KingEmet/docker,SvenDowideit/docker,yosifkit/docker,pramodhkp/moby,dims/docker,mixja/docker,miminar/docker,haveatry/docker,PatrickLang/moby,nalind/docker,moul/docker,rancher/docker,allencloud/docker,liaoqingwei/docker,nawawi/docker,tonistiigi/docker,ripcurld0/moby,coolljt0725/docker,tmp6154/docker,dmcgowan/docker,Ramzec/docker,yummypeng/docker,fcrisciani/docker,danyalKhaliq10p/moby,KingEmet/docker,shishir-a412ed/docker,ripcurld0/moby,coreos/docker,srust/docker,tmp6154/docker,moul/docker,johnstep/moby-moby,rhatdan/docker,tophj-ibm/moby,hqhq/moby