scripts: Don't erase gopath.proto after genproto.sh
scripts: Don't erase gopath.proto after genproto.sh

Wiping gopath.proto after a successful run does nothing but slow down
the next run unnecessarily as it downloads everything again.

ajityagaty/etcd,plasticbox/etcd,tguangch/etcd,bluebreezecf/etcd,ajityagaty/etcd,whuwxl/etcd,mqliang/etcd,dannysauer/etcd,glevand/coreos--etcd,etcd-io/etcd,whuwxl/etcd,sebrandon1/etcd,li-ang/etcd,glevand/coreos--etcd,akauppi/etcd,insequent/etcd,YuleiXiao/etcd,ajityagaty/etcd,sinsharat/etcd,rchicoli/etcd,yudai/etcd,rnaveiras/etcd,luxas/etcd,lorneli/etcd,etcd-io/etcd,CrazyJvm/etcd,lorneli/etcd,zaphod-concur/etcd,heyitsanthony/etcd,qqsun8819/etcd,mkumatag/etcd,coreos/etcd,jlamillan/etcd,sinsharat/etcd,ravigadde/etcd,mkumatag/etcd,armstrongli/etcd,endocode/etcd,xiang90/etcd,joshix/etcd,bluebreezecf/etcd,hongchaodeng/etcd,a-robinson/etcd,nekto0n/etcd,yudai/etcd,vimalk78/etcd,visheshnp/etcd,rnaveiras/etcd,sebrandon1/etcd,mkumatag/etcd,fanminshi/etcd,ravigadde/etcd,mickep76/etcd,bdarnell/etcd,tguangch/etcd,plasticbox/etcd,joshix/etcd,OyTao/etcd_learning,insequent/etcd,CrazyJvm/etcd,mickep76/etcd,armstrongli/etcd,nekto0n/etcd,lumjjb/etcd,YuleiXiao/etcd,fanminshi/etcd,handsomesun/etcd,handsomesun/etcd,dannysauer/etcd,bdarnell/etcd,gyuho/etcd,hongchaodeng/etcd,etcd-io/etcd,akauppi/etcd,xiang90/etcd,heyitsanthony/etcd,a-robinson/etcd,OyTao/etcd_learning,cockroachdb/etcd,rchicoli/etcd,vimalk78/etcd,cockroachdb/etcd,qqsun8819/etcd,mqliang/etcd,rnaveiras/etcd,coreos/etcd,visheshnp/etcd,endocode/etcd,lumjjb/etcd,mqliang/etcd,li-ang/etcd,zaphod-concur/etcd,luxas/etcd,jlamillan/etcd,gyuho/etcd