Fix client TLS in neutron-metadata-agent

Backport to: Train.

Change-Id: Ide96ea43739d47e623026f0aecd4163f3a2abe7f
Closes-bug: #1864615

ansible/roles/neutron/templates/metadata_agent.ini.j2

 # metadata_agent.ini
 [DEFAULT]
 nova_metadata_host = {{ nova_internal_fqdn }}
-
 nova_metadata_port = {{ nova_metadata_port }}
 metadata_proxy_shared_secret = {{ metadata_secret }}
+nova_metadata_protocol = {{ internal_protocol }}

releasenotes/notes/bug-1864615-84b4b58ea57ecfe9.yaml

+---
+fixes:
+  - |
+    Fix protocol used by ``neutron-metadata-agent`` to connect to Nova metadata
+    service. This possibly affected internal TLS setup.
+    Fixes `LP#1864615 <https://bugs.launchpad.net/kolla-ansible/+bug/1864615>`__