fix rspec tests in backend::rbd and notify::qpid

The tests in the second part of the file have never
been executed.
Also fixed typo's in notify:qpid which did not result in
errors, since the tests where not executed.

Closes-bug: #1301001

Change-Id: I97f3ee9f2d4073a218cc3866dc24701c99254757
Merge git://github.com/puppetlabs/puppetlabs-glance