Resolve Bug:681 - Fix config module registration to Service Registry.

Rework OSGi service registration during second phase commit: only service references
will be registered into SR, instead of old behaviour when each module's service
interfaces were used. Only one key-value entry is persisted in registration:
{name: name of service reference} .

Change-Id: I25249fe8f9e51570cd3ea963e91145b7e44da57d
Signed-off-by: Tomas Olvecky <tolvecky@cisco.com>