NSX: get_port_status passed wrong id for network

The call to get_port_status in update_port was passing in the neutron
network_id instead of the nsx_network_id. These used to be the same
but now are different. This patch updates the code so that it now
passes in the correct uuid.

Change-Id: I7b0bd617f68291fa457a49e52d595bb8de1d4835
Closes-bug: #1281789
Merge "NSX: get_port_status passed wrong id for network"