Move ServiceReferenceMXBean to config-api

Move ServiceReferenceMXBean to api in order to use it in config-util.
Deprecate newMBeanProxy methods in config registry and transaction client.
Make methods newMXBeanProxy aware of service references, add transaction
name silently when using transaction client's newMXBeanProxy.

Change-Id: I67daab1bcee6a1345beb80957dca91b452cfee67
Signed-off-by: Tomas Olvecky <tolvecky@cisco.com>
Merge "Move ServiceReferenceMXBean to config-api"