Updated openstack/openstack
Project: openstack/tempest  fc1176937a5cf544d3176e953e520394b2565698

adds the missing _interface variable

This patch adds the _interface variable in the JSON
test class 'AvailabilityZoneTestJSON'

Change-Id: Ib50626c9e163f13e2cb99b3faa356a17974ab548
Closes-Bug: 1326347