tests: ignore leaked readLoop on go <1.5
tests: ignore leaked readLoop on go <1.5

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