added isInterface test for listener registration
AuthenticationHolder for rest authentication

Change-Id: Idf0dfe2ce40d862490eb52b2344e7974d14da148
Signed-off-by: Martin Bobak <mbobak@cisco.com>
added missing payload extraction in proxy method
added request type to event stream context calls

Change-Id: Ibecf4ec59f53aa1bf0dcbf1295533b23a0c5b3c4
Signed-off-by: Martin Bobak <mbobak@cisco.com>