1100005 & 1101717 -- NoAvailableQueues fix

Fixes two bugs:

Fix for No Available Queues, [BZ 1100005](https://bugzilla.redhat.com/show_bug.cgi?id=1100005)
Fix memory leak in qpid.messaging, [BZ 1101717](https://bugzilla.redhat.com/show_bug.cgi?id=1101717)

Bumps the version to python-kombu-3.0.15-8.  It skips a version because the -7 release version (in history) did not pass all Python 2.6 tests.