This will help make MovePage more testable.
In the course of abstracting the logic out of ParserFactoryTest to
FactoryArgTestTrait so it could be used in MovePageFactoryTest, I made
them all unit tests instead of integration. This required some
modification to the Parser constructor so that it didn't access
MediaWikiServices unnecessarily.
Change-Id: Idaa1633f32dfedfa37516bb9180cfcfbe7ca31aa
