Moved the retrieval of the LoggerContext from class variables configured in the test setUp() to local variables in the actual tests.
Added a try/finally block around each of the ScalaTests for the LoggingServiceImpl to ensure the ConfigurationFactory.CONFIGURATION_FILE_PROPERTY is cleared.
Merge pull request #1182 from rackerlabs/FixNewFlakyTestsCausedByLog4J2xSetup

Moved LoggerContext configuration.