test_cel: Fix unit tests broken due to event def changes from res_corosync

This patch instructs test_cel to skip any IE types it doesn't care about. The
addition of the raw and bitfield types caused the tests to fail.
........

Merged revisions 414528 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@414529 65c4cc65-6c06-0410-ace0-fbb531ad65f3