oo-diagnostics: test_mcollective_direct_addressing

Add test_mcollective_direct_addressing, which checks that direct_addressing
is disabled in MCollective's client.cfg (on broker hosts) and server.cfg
(on node hosts).

This commit fixes bug 1144615.
Merge pull request #5828 from Miciah/bug-1144615-oo-diagnostics-test_mcollective_direct_addressing

Merged by openshift-bot