Fix nova fakes for server listing
Fix nova fakes for server listing

With python-novaclient 10.2.0 after eff607ccef91d09052d58f6798f68d67404f51ce
server listing is done in multiple requests.

Change-Id: Ib02278fca2a17ce2f26d5e28a5ac0971bd80657a
Closes-Bug: #1766254

openstack/heat,openstack/heat,noironetworks/heat,noironetworks/heat