Support to inject custom controller info through openstacknode

Change-Id: I3a545477b99f515b9e35ee0e7d5aaa03d979eaf7
diff --git a/apps/openstacknetworking/network-cfg.json b/apps/openstacknetworking/network-cfg.json
index 703d0e9..76c5c09 100644
--- a/apps/openstacknetworking/network-cfg.json
+++ b/apps/openstacknetworking/network-cfg.json
@@ -19,6 +19,20 @@
                 "network": "oamnetwork",
                 "intf": "eth4"
               }
+            ],
+            "controllers": [
+              {
+                "ip": "10.10.10.2",
+                "port": 6653
+              },
+              {
+                "ip": "10.10.10.3",
+                "port": 6653
+              },
+              {
+                "ip": "10.10.10.4",
+                "port": 6653
+              }
             ]
           },
           {