Add container context debug osgi cli command to Switch Manager

CHANGES:
Available osgi comamnds implemented in the service classes
do not allow to access the desired container instance of service.
This change, following example in Gerrit #831, allow to dump the
nodes and node connectors database contained in Switch Manager
for the desired container.

Change-Id: I4cf959763e06facd135a1a5c3ebca59ee85bcf22
Signed-off-by: Alessandro Boch <aboch@cisco.com>