raft: dont allocate slice and sort on every commit
raft: dont allocate slice and sort on every commit

rnaveiras/etcd,joshix/etcd,coreos/etcd,mqliang/etcd,etcd-io/etcd,mkumatag/etcd,mqliang/etcd,li-ang/etcd,etcd-io/etcd,xiang90/etcd,gyuho/etcd,rnaveiras/etcd,mkumatag/etcd,dannysauer/etcd,xiang90/etcd,vimalk78/etcd,cockroachdb/etcd,ajityagaty/etcd,vimalk78/etcd,dannysauer/etcd,mqliang/etcd,ajityagaty/etcd,joshix/etcd,gyuho/etcd,li-ang/etcd,coreos/etcd,ajityagaty/etcd,sinsharat/etcd,sinsharat/etcd,cockroachdb/etcd,etcd-io/etcd,rnaveiras/etcd,mkumatag/etcd