rhbz987707 - Replace outdated (and invalid) use of natural Id search.

Searching by a class that did not have a natural Id. Replaced with a criteria query.
Disable randomly failing test.

This test should later be converted to an Arquillian test.
Merge pull request #99 from zanata/rhbz987707

rhbz987707 - Replace outdated (and invalid) use of natural Id search.