Add rlimit code to allow openais to work with linux kernel 2.6.9 or later

BKrev: 4182db2fMpOhxCxRnyhHxC5YOCUhvg


git-svn-id: http://svn.fedorahosted.org/svn/corosync/trunk@367 fd59a12c-fef9-0310-b244-a6a79926bd2f