Prevent logback-test.xml from being picked up by Eclipse twice.

Logback does not like it when you provide more than one configuration
file.  Eclipse, however, places all the test resources from subprojects
in the classpath.  Consequently, when you run tests from Eclipse,
Logback emits a warning that multiple configuration files were found.

We'll just delete logback-test.xml from candlepin-common because it's
not that crucial.

See http://jira.qos.ch/browse/LOGBACK-618
Remove obnoxious Hibernate UUID warning from test logging.
Used dependency injection in unit tests.