Add a default gateway parameter for metadata access from remote
network.
This parameter is necessary when NSXv metadata proxy is on a different
cluster than the management VM and network, and hence requires routing.
Change-Id: I420f48ee315e4406a1a684467bcea0cb8a79f53f
Partially-Implements: blueprint vmware-nsx-v
# (Optional) Management network netmask for metadata proxy
# mgt_net_proxy_netmask =
+# (Optional) Management network default gateway for metadata proxy
+# mgt_net_default_gateway =
+
# (Optional) IP addresses used by Nova metadata service
# nova_metadata_ips =