[ARCUNIT] Set the ConfigurationManager of ConfigurationDrivenUnitTestEngines
The Configuration Manager is supported by ArcanistUnitTestEngine but not support by the ArcanistConfigurationDrivenUnitTestEngine.
Added the configuration manager as one of the initially set properties of an ArcUnitTestEngine created by the ArcanistConfigurationDrivenTestEngine
Test Plan: Ran arc unit against a project without the change, verified the Configuration was none. Added this change and ran again and verified it was set
Reviewers: epriestley, Blessed Reviewers
Reviewed By: epriestley, Blessed Reviewers
Differential Revision: https://secure.phabricator.com/D19465