Adds call to evconnlistener_free() in peers.c.
Adds call to evconnlistener_free() in peers.c.

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