raft : `newRaft()` does check for validity of `Config`
raft : `newRaft()` does check for validity of `Config`

rnaveiras/etcd,li-ang/etcd,rnaveiras/etcd,dannysauer/etcd,li-ang/etcd,gyuho/etcd,coreos/etcd,etcd-io/etcd,ajityagaty/etcd,cockroachdb/etcd,dannysauer/etcd,mkumatag/etcd,mqliang/etcd,mqliang/etcd,ajityagaty/etcd,mqliang/etcd,mkumatag/etcd,ajityagaty/etcd,etcd-io/etcd,coreos/etcd,cockroachdb/etcd,gyuho/etcd,mkumatag/etcd,rnaveiras/etcd,etcd-io/etcd