Description of problem:
On an upgraded 7.3 -> 8 overcloud with IPv6 and SSL enabled nova actions don't seem to work:

nova stop gets stuck with:
+--------------------------------------+----------------------------------------------------+--------+--------------+-------------+--------------------------------------------------------------------------------------------------+
| ID                                   | Name                                               | Status | Task State   | Power State | Networks                                                                                         |
+--------------------------------------+----------------------------------------------------+--------+--------------+-------------+--------------------------------------------------------------------------------------------------+
| e77840a3-16e7-43d7-aabd-cf692bfa1c67 | stack01-vm01-e7m4o32flx6k-my_instance-grzhrkgaxtms | ACTIVE | powering-off | Running     | stack01-tenant_net_ext_tagged-6nhgb6atedw6-private_network-orpaxopacser=10.10.10.5, 172.29.0.102 |

nova console-log stack01-vm03-7ugy44tktpw6-my_instance-hle7zkkgfbmv:
ERROR (ConnectFailure): Unable to establish connection to https://[2001:db8:fd00:1000::10]:13774/v2/148059d8eac544b4bc422ad3d894c086/servers/ed166417-8149-4c5f-9c85-1f078113d742/action


nova get-vnc-console stack01-vm03-7ugy44tktpw6-my_instance-hle7zkkgfbmv novnc
ERROR (ConnectFailure): Unable to establish connection to https://[2001:db8:fd00:1000::10]:13774/v2/148059d8eac544b4bc422ad3d894c086/servers/ed166417-8149-4c5f-9c85-1f078113d742/action

Version-Release number of selected component (if applicable):
openstack-tripleo-heat-templates-0.8.14-7.el7ost.noarch

How reproducible:
100% 

Steps to Reproduce:
1. Deploy IPv6+SSL overcloud with OSPd 7.3
2. Upgrade deployment to version 8
3. Run nova actions for existing running instances on the overcloud

Actual results:
The commands fail.

Expected results:
I am able to manage running instances.