Revision 917537

Applying DOSGI-13 handlers_and_tck.patch on behalf or Marc Schaaf. 
This patch contains the following:
 * TCK: DSW: import / export calls now return empty lists instead of null
 * TCK: DSW: Fixed some issues with the handling of intents
 * Changed the testServiceExport() test case of the Topology manager from a thread.sleep to a lock based mechanism
 * DSW: Re-enabled most of the old handlers and their corresponding test cases. However most of them are not yet complete (impl + tests).
 * Did some minor refactoring and some cleanup
 * Made a minor addition to the Zookeeper discovery to better support String[] and List<String> however a more decent format is necessary see DOSGI-61
 * DSW: Fixed an issue with the unimport of a service that was referenced more than once
 * DSW: Cleaned some redundant code from shutdown procedure