FELIX-4385: Applied the patch fixing the NPE when configuration is deleted at the same time 
the corresponding ManagedService service is unregistered from the OSGi registry.
Also added the corresponding integration test.


git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@1563946 13f79535-47bb-0310-9956-ffa450edef68
[FELIX-4370] Support for RepositoryContent interface

Added test and also some other refactoring/improvements.


git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@1563948 13f79535-47bb-0310-9956-ffa450edef68