Revert "etcdserver: handle raft Propose error in v2 applier"
Revert "etcdserver: handle raft Propose error in v2 applier"

This reverts commit b38e138baf17e1ac742d34ed63d72f777e1a1bfe.

xiang90/etcd,bdarnell/etcd,fanminshi/etcd,coreos/etcd,sebrandon1/etcd,lorneli/etcd,dannysauer/etcd,rnaveiras/etcd,li-ang/etcd,joshix/etcd,etcd-io/etcd,xiang90/etcd,ajityagaty/etcd,sebrandon1/etcd,cockroachdb/etcd,cockroachdb/etcd,mqliang/etcd,ajityagaty/etcd,rnaveiras/etcd,sinsharat/etcd,lorneli/etcd,glevand/coreos--etcd,vimalk78/etcd,vimalk78/etcd,li-ang/etcd,gyuho/etcd,etcd-io/etcd,etcd-io/etcd,sinsharat/etcd,ajityagaty/etcd,mkumatag/etcd,mqliang/etcd,mkumatag/etcd,gyuho/etcd,glevand/coreos--etcd,fanminshi/etcd,coreos/etcd,mkumatag/etcd,dannysauer/etcd,bdarnell/etcd,joshix/etcd,rnaveiras/etcd,mqliang/etcd