Support for mongodb replicaset connection (HA).

Added replicaset field in nbi.cfg file, which is used in
mongodb connection string (osm_common/db_mongo.py).

Change-Id: I5b4c15463a6593319f2d9f097b41a3bb9688fcc6
Signed-off-by: Vijay Nag B S <vijaynag.bs@tataelxsi.co.in>
diff --git a/osm_nbi/nbi.cfg b/osm_nbi/nbi.cfg
index d279f90..3e8463a 100644
--- a/osm_nbi/nbi.cfg
+++ b/osm_nbi/nbi.cfg
@@ -60,6 +60,7 @@
 host:   "mongo"            # hostname or IP
 port: 27017
 name: "osm"
+# replicaset: "replicaset"
 # user: "user"
 # password: "password"
 # commonkey: "commonkey"