Adding actor supervisor, more logs and tests

Actor Supervisor will start rpcRegistry and rpcBroker actors and will resume them in case of exception
More logs have been added along with some unit test cases of xmlutil

Change-Id: I30101bd3b8ac6821b58b3e1a2421f7f1af26bcd1
Signed-off-by: Harman Singh <harmasin@cisco.com>