Updated ovsvapp_agent.ini in neutron

we have added the vxlan support for OVSvApp l2 Agent.

References:
https://review.openstack.org/#/c/168866/
https://review.openstack.org/#/c/175148/
https://review.openstack.org/#/c/177616/

Change-Id: I8061a1280b765e71aa682711c55c469f8425dac6

etc/neutron/plugins/ovsvapp/ovsvapp_agent.ini

@@ -35,9 +35,15 @@
 # esx_maintenance_mode = True
 
 [ovsvapp]
-# Currently OVSvApp Agent supports only VLAN.
+# Network type for tenant networks.
+# tenant_network_type =
+# OVSvApp L2 Agent supports either VLAN or VXLAN.
+# Example:
 # tenant_network_type = vlan
 
+# Local IP address of VXLAN tunnel endpoint.
+# local_ip =
+
 # OVS integration bridge.
 # integration_bridge = br-int