Removes leader_announce_msg and alive_ping_msg. These were not used.
Removes leader_announce_msg and alive_ping_msg. These were not used.

tyh20082000/libpaxos,tudang/paxosudp,tyh20082000/libpaxos,tudang/paxosudp,tudang/paxosudp,tyh20082000/libpaxos,tudang/paxosudp,tyh20082000/libpaxos,tudang/paxosudp,tudang/paxosudp