cdk-addons 1.18 fails when kubernetes-master is related to openstack-integrator

[George Kraft]

Traceback (most recent call last):
  File "/snap/cdk-addons/1886/apply", line 359, in <module>
    main()
  File "/snap/cdk-addons/1886/apply", line 28, in main
    if render_templates():
  File "/snap/cdk-addons/1886/apply", line 179, in render_templates
    render_template("cloud-config-secret.yaml", openstack_context)
  File "/snap/cdk-addons/1886/apply", line 209, in render_template
    with open(source) as f:
FileNotFoundError: [Errno 2] No such file or directory: '/snap/cdk-addons/1886/templates/cloud-config-secret.yaml'

Observed in https://bugs.launchpad.net/charm-kubernetes-master/+bug/1869388

I believe this was introduced by https://github.com/charmed-kubernetes/cdk-addons/pull/167

[George Kraft (cynerva)]

PR: https://github.com/charmed-kubernetes/cdk-addons/pull/173

Backported to release-1.18: https://github.com/charmed-kubernetes/cdk-addons/commit/830fb7f5eb17b8b61c27a41a00312395ade9e5ee