TestProgressLeader
TestProgressLeader

This was expecting the progress of the leader to be updated as a
result of MsgProp but it is now happening in `(*raft).advance`.

Signed-off-by: Tobias Grieger <2f4c93e02da5d1f108ee22ef1e8115acadb15fa2@gmail.com>

ajityagaty/etcd,ajityagaty/etcd,etcd-io/etcd,etcd-io/etcd,ajityagaty/etcd,etcd-io/etcd