MINOR: peers: move messages treatment code to reduce the size of the I/O handler.

Extract the code of the peer I/O handler responsible of treating
any peer protocol message to create peer_treat_awaited_msg() function.
Also rename peer_recv_updatemsg() to peer_treat_updatemsg() as this
function only parse a stick-table update message already received
by peer_recv_msg().

May be backported as far as 1.5.
1 file changed