evt code updated to handle cluster config changes better. Now,
when a node joins, it is sent any retained events that have time
left on them. Also, if the joining node had been a part of the cluster
in the past, it is sent the next event ID that it should use so as to
not generate duplicate event IDs. Channel open requests are now
completed in the exec handler, with channel close code to follow later.

(Logical change 1.84)


git-svn-id: http://svn.fedorahosted.org/svn/corosync/trunk@307 fd59a12c-fef9-0310-b244-a6a79926bd2f