AutoLoaderTest: Add support for class aliases

AutoLoaderTest: Add support for class aliases

* Changed the regex to match class aliases, and added a check to
  also ensure that all aliases for a class are in the same file as
  the class (see cb77e59f7c99 for explanation).
* Removed support for the seemingly unmaintained Parsekit extension
  (no release since 2009, and known not to compile against PHP 5.4).
  The test would currently fail if Parsekit were used anyway because
  the class MyLocalSettingsGenerator is commented out.

Change-Id: I7be2352f4659abc7b4952a9f74a14d0cef911614