Add get_vapp_edge_public_ip and get_vapp_port_forwarding_rules
Add get_vapp_edge_public_ip and get_vapp_port_forwarding_rules

The first method allows us to fetch the public IP of a vApp
when using a vShield Edge device to fence it using port
forwarding mode.

The second method returns a vApp portforwarding rules.

ChineduUzoka/vcloud-rest,astratto/vcloud-rest,mhemesath/vcloud-rest,vmware/vcloud-rest,felixhoo/vcloud-rest,marbe/vcloud-rest