Avoid duplicated project_id when show network
Avoid duplicated project_id when show network

Project_id appear twice when show network. This
patch check and not append if it already has one.

Change-Id: I4400239f454522101b639a0412050dd60eb6a612
Closes-Bug: #1636123
Partially-Implements: blueprint duplicated-project-id

dtroyer/python-openstackclient,openstack/python-openstackclient,openstack/python-openstackclient,dtroyer/python-openstackclient