Feature 10958: Audit Logs for OSM

Added support for audit logs following CEF format in nbi.py,
auth.py and authconn_internal.py.

Change-Id: Ia4ef2fd7097a81d031d6e1bc68a779f536675fef
Signed-off-by: elumalai <deepika.e@tataelxsi.co.in>
7 files changed