Charm errors out due to reference to non-existing configuration template when deployed on Mitaka

[Frode Nordahl]

2020-05-18 13:04:14 ERROR juju-log identity-service:43: Could not load template manila-api.conf from None.
2020-05-18 13:04:14 ERROR juju-log identity-service:43: Could not load template etc_apache2_sites-available_manila-api.conf from None.
2020-05-18 13:04:14 ERROR juju-log identity-service:43: Hook error:
Traceback (most recent call last):
  File "/var/lib/juju/agents/unit-manila-4/.venv/lib/python3.5/site-packages/charms_openstack/charm/core.py", line 809, in render_configs
    _render(os.path.basename(conf))
  File "/var/lib/juju/agents/unit-manila-4/.venv/lib/python3.5/site-packages/charms_openstack/charm/core.py", line 806, in _render
    perms=self.permission_override_map.get(conf) or 0o640,
  File "/var/lib/juju/agents/unit-manila-4/.venv/lib/python3.5/site-packages/charmhelpers/core/templating.py", line 84, in render
    raise e
  File "/var/lib/juju/agents/unit-manila-4/.venv/lib/python3.5/site-packages/charmhelpers/core/templating.py", line 79, in render
    template = template_env.get_template(source)
  File "/var/lib/juju/agents/unit-manila-4/.venv/lib/python3.5/site-packages/jinja2/environment.py", line 830, in get_template
    return self._load_template(name, self.make_globals(globals))
  File "/var/lib/juju/agents/unit-manila-4/.venv/lib/python3.5/site-packages/jinja2/environment.py", line 804, in _load_template
    template = self.loader.load(self, name, globals)
  File "/var/lib/juju/agents/unit-manila-4/.venv/lib/python3.5/site-packages/jinja2/loaders.py", line 408, in load
    raise TemplateNotFound(name)
jinja2.exceptions.TemplateNotFound: manila-api.conf

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/728919

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/728919
Committed: https://git.openstack.org/cgit/openstack/charm-manila/commit/?id=b1a20a21f2bae8dcbe97960d6fe2d461c46f7328
Submitter: Zuul
Branch: master

commit b1a20a21f2bae8dcbe97960d6fe2d461c46f7328
Author: Frode Nordahl <email address hidden>
Date: Mon May 18 16:49:31 2020 +0200

    Move WSGI configuration template

    The charm currently provides the ``manila-api.conf`` in the
    pike templates folder, but attempts to use it for all
    supported releases.

    Move the template to the earliest supported release to avoid
    hook errors.

    Change-Id: I16135e6535f8cabe9caa6693a6ee8a228dcb4b65
    Closes-Bug: #1879337