tools/benchmark: report standard deviation
tools/benchmark: report standard deviation

wantonsolutions/dinv-etcd,plasticbox/etcd,rchicoli/etcd,etcd-io/etcd,xiang90/etcd,coreos/etcd,dannysauer/etcd,ktateish/etcd,Timer/etcd,purpleidea/etcd,ravigadde/etcd,achanda/etcd,dannysauer/etcd,mickep76/etcd,sofuture/etcd,jonboulle/etcd,heyitsanthony/etcd,jlamillan/etcd,shawnps/etcd,raoofm/etcd,siddontang/etcd,bluebreezecf/etcd,dnaeon/etcd,plasticbox/etcd,lorneli/etcd,linuxcer/etcd,rchicoli/etcd,swingbach/etcd,sebrandon1/etcd,tamird/etcd,ajityagaty/etcd,gyuho/etcd,luxas/etcd,achanda/etcd,shawnps/etcd,chipironcin/etcd,whuwxl/etcd,zaphod-concur/etcd,westhood/etcd,OyTao/etcd_learning,sofuture/etcd,a-robinson/etcd,wantonsolutions/dinv-etcd,handsomesun/etcd,luxas/etcd,OyTao/etcd_learning,StorReduce/etcd,gyuho/etcd,insequent/etcd,YuleiXiao/etcd,sebrandon1/etcd,StorReduce/etcd,jonboulle/etcd,mickep76/etcd,fanminshi/etcd,vimalk78/etcd,dnaeon/etcd,sinsharat/etcd,mqliang/etcd,swingbach/etcd,mkumatag/etcd,qqsun8819/etcd,tamird/etcd,yudai/etcd,endocode/etcd,rnaveiras/etcd,li-ang/etcd,raoofm/etcd,visheshnp/etcd,sinsharat/etcd,ravigadde/etcd,tguangch/etcd,CrazyJvm/etcd,akauppi/etcd,joshix/etcd,joshix/etcd,rnaveiras/etcd,wantonsolutions/dinv-etcd,zaphod-concur/etcd,yudai/etcd,siddontang/etcd,Timer/etcd,ajityagaty/etcd,xiang90/etcd,endocode/etcd,hongchaodeng/etcd,mqliang/etcd,westhood/etcd,ktateish/etcd,YuleiXiao/etcd,tguangch/etcd,coreos/etcd,qqsun8819/etcd,handsomesun/etcd,chipironcin/etcd,li-ang/etcd,ajityagaty/etcd,mkumatag/etcd,bdarnell/etcd,rnaveiras/etcd,visheshnp/etcd,nekto0n/etcd,glevand/coreos--etcd,mqliang/etcd,cockroachdb/etcd,whuwxl/etcd,insequent/etcd,fanminshi/etcd,armstrongli/etcd,purpleidea/etcd,jlamillan/etcd,vimalk78/etcd,hongchaodeng/etcd,mkumatag/etcd,lumjjb/etcd,etcd-io/etcd,glycerine/etcd,bdarnell/etcd,glevand/coreos--etcd,linuxcer/etcd,nekto0n/etcd,akauppi/etcd,glycerine/etcd,a-robinson/etcd,CrazyJvm/etcd,cockroachdb/etcd,lumjjb/etcd,bluebreezecf/etcd,heyitsanthony/etcd,lorneli/etcd,etcd-io/etcd,armstrongli/etcd