Description of problem: RHOS 13 TLS E deployment with the following extra THT param deploy, fails test_novnc test with mentioned error:
ServiceNetMap.NovaLibvirtNetwork=ctlplane

How reproducible: always

Steps to Reproduce:
1. Deploy RHOS 13 with TLS Everywhere and following THT parameter:
    ServiceNetMap
        NovaLibvirtNetwork=ctlplane
2. Run tempest test tempest.api.compute.servers.test_novnc.NoVNCConsoleTestJSON.test_novnc
3. Test fails

Actual results:
       Body: {"os-getVNCConsole": {"type": "novnc"}}
    Response - Headers: {'status': '200', u'content-length': '144', 'content-location': 'https://overcloud.redhat.local:13774/v2.1/servers/21a9b536-1162-43d5-8e38-4f4d68bbf788/action', u'x-compute-request-id': 'req-80c6f4bd-9aab-4c50-8db8-d46da77d930e', u'vary': 'OpenStack-API-Version,X-OpenStack-Nova-API-Version,Accept-Encoding', u'server': 'Apache', u'openstack-api-version': 'compute 2.1', u'connection': 'close', u'x-openstack-nova-api-version': '2.1', u'date': 'Wed, 16 Sep 2020 14:38:46 GMT', u'content-type': 'application/json', u'x-openstack-request-id': 'req-80c6f4bd-9aab-4c50-8db8-d46da77d930e'}
        Body: {"console": {"url": "https://overcloud.redhat.local:13080/vnc_auto.html?path=%3Ftoken%3D885cd4b8-3c0a-487c-91b8-33fe326bc9f1", "type": "novnc"}}
}}}

Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/tempest/api/compute/servers/test_novnc.py", line 188, in test_novnc
    self._validate_rfb_negotiation()
  File "/usr/lib/python2.7/site-packages/tempest/api/compute/servers/test_novnc.py", line 91, in _validate_rfb_negotiation
    'Token must be invalid because the connection '
  File "/usr/lib/python2.7/site-packages/unittest2/case.py", line 672, in assertFalse
    raise self.failureException(msg)
AssertionError: True is not false : Token must be invalid because the connection closed.

Expected results:
Test passed

Additional info:
Logs and job in #c1