support stats reported by APBR Midstream
support stats reported by APBR Midstream

handle APBR Midstream structured syslog messages
which now has bytes info for last interface used
for the session, enabling correct accounting of
bytes against appropriate interface.
Also, used source-zone-name as the department

Change-Id: I411aa36da6179e074c50544c377c9d8c9a3d6f5b
Closes-Bug: #1714174

nischalsheth/contrail-controller,eonpatapon/contrail-controller,rombie/contrail-controller,rombie/contrail-controller,nischalsheth/contrail-controller,rombie/contrail-controller,eonpatapon/contrail-controller,nischalsheth/contrail-controller,eonpatapon/contrail-controller,rombie/contrail-controller,rombie/contrail-controller,eonpatapon/contrail-controller,eonpatapon/contrail-controller,nischalsheth/contrail-controller,eonpatapon/contrail-controller,rombie/contrail-controller,rombie/contrail-controller,eonpatapon/contrail-controller,nischalsheth/contrail-controller,nischalsheth/contrail-controller,nischalsheth/contrail-controller,nischalsheth/contrail-controller