Remove ais_evt.h since its content has been moved.

BKrev: 4203e785HE6cQ-KCAgc-CHHOiZ0tEg


git-svn-id: http://svn.fedorahosted.org/svn/corosync/trunk@474 fd59a12c-fef9-0310-b244-a6a79926bd2f