build: parse go version at go tip
build: parse go version at go tip

This parses go version when build is running
in moast recent go master branch.

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