raft: always mark leader as RecentActive
raft: always mark leader as RecentActive

RecentActive is now initialized to true in `becomeLeader`. Both
configuration changes and CheckQuorum make sure not to break this,
so we now now that the leader is always RecentActive.

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

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