Use special event ID for setting the default in a new event and to indicate
a lost event. Update subscription test to look for the "lost" event ID.

BKrev: 42128170Q5DcNymwbx8NushEykXwmg


git-svn-id: http://svn.fedorahosted.org/svn/corosync/trunk@494 fd59a12c-fef9-0310-b244-a6a79926bd2f