This patch fixes crashes found by repeated pacemaker CTS SimluStart
tests. When you bring up the nodes together it can cause a lot of
configuration changes and sync gets started and aborted
lots of times.
When abort is called the ring_id is not changed which means that any
sync packet that arrive from that point on will be accepted as valid.
I have seen old barrier messages causing the processing index to increment
later causing an array out of bounds.
This patch memsets the ring_id to 0, thus causing the ring_id in the packet and
my_ring_id not to match.
git-svn-id: http://svn.fedorahosted.org/svn/corosync/trunk@2757 fd59a12c-fef9-0310-b244-a6a79926bd2f
