[KARAF-7517] [KARAF-7518] [KARAF-7515] [KARAF-7433] Karaf Cellar DOSGi rework

[Maurice-Betzel]

[KARAF-7517] Avoid local removal of remote service if more consumers remain after uninstall of a consumer
[KARAF-7518] Remove locally registered remote service if no longer available
[KARAF-7515] Return CancellationException instead of null if service not reachable
[KARAF-7433] Added cluster wide propagation of service properties

Additional:
-Added plenty of logging
-Some code cleanup and renaming
-Added and renamed constants in Constants.java
-Shell listing of services now sorted and extended with the endpoint Id
-ImportServiceListener internal thead no longer dying on collection modification

[Maurice-Betzel]

Last commit added the filter propagation to the service calling part and I added some more context into the listing of the remote services.
The instance on the bottom is only a provider of remote services with the local bundles listed doing the provisioning. The 305 bundle being a whiteboard setup. The UID service 130 is local, whereas the 918 represents the DOSGi bundle being a remote endpoint on the 5702 port NOT imported locally due to the local service available. The 'x' marks this node.
The instance in the middle provides an other whiteboard on 150 and has a UID service and client installed. The local service being the 185 bundle, the client is the 872 bundle and the 1187 is the DOSGi endpoint from the 5703 port.
The third instance has 2 UID consumers, bundle 513 and 514 consuming from the remote endpoint nodes 5702 and / or 5703 presented by the DOSGi bundle 1716. and a local service from bundle 639 gets a remote endpoint on the cluster.