Mostly event service updates to handle recovery after a
configuration change. (Selecting next event ID and sending retained
events to the joiner).

BKrev: 4159ad7atHUdo0CF1QjlYHOM-fjAvQ


git-svn-id: http://svn.fedorahosted.org/svn/corosync/trunk@306 fd59a12c-fef9-0310-b244-a6a79926bd2f