Revision 1724802

Code review:

- cleaned up the code to use more recent Java constructs, such as foreach
  loops;
- cleaned up the test cases to make them a bit more readable and easier to
  maintain by folding some duplicate code into helper methods;
- fixed a corner case in which an AutoConf resource drops a configuration while
  updating existing ones at the same time. A NPE could be thrown in this
  situation due ConfigurationAdmin not being present;
- fixed a corner case in which a resource is dropped twice. A IOException could
  be thrown;
- moved some really specific MetaType code to a utility class;
- added some test cases for PersistencyManager;
- applied the code formatting guidelines for Apache Felix.