[FABRIC-529] Reenable PatchServiceImplTest
Replace task definition with task configuration in TaskContext, so that we are able to pass all the configuration as part of the context. Ensure worker properly cleans up when gets stopped.
Update doc on fabric-partition. Misc improvements / fixes.
easier to use JMX MetaType API thats less dependent on which bundle defines metatype info
avoid the unnecessary reference to the FabricService on the OSGi MetaType JMX API