New Variable to check l2 gateway, Bridge type.

Is it based on ESXi Bridge Cluster or Edge Endpoint Bridge Profile.

Change-Id: Ibf8b8461c7e270eccf7c072418f64b61f7d92e4b

vmware_nsx_tempest_plugin/config.py

@@ -200,6 +200,10 @@ NSXv3Group = [
                 default=False,
                 help="enable ens based changes like port-security-disabled"
                      " no security-group"),
+    cfg.BoolOpt('bridge_cluster',
+                default=False,
+                help="Use Bridge ESXi based cluster id or Bridge Edge Endpoint"
+                     " profile"),
 ]
 
 dns_group = cfg.OptGroup(name='dns',