map_cell0 can be undefined when kolla-ansible tag specified

[Doug Szumski]

To reproduce bring up a Kolla vagrant dev environment using default settings and then for example enable monasca and run:

kolla-ansible deploy -t monasca

Ansible will fail because map_cell0 is undefined owing to the fact that the nova plays were skipped:

TASK [nova : include] ********************************************************************************************
task path: /usr/share/kolla-ansible/ansible/roles/nova/tasks/simple_cell_setup.yml:14
fatal: [localhost]: FAILED! => {"msg": "The conditional check 'map_cell0.changed' failed. The error was: error whi
valuating conditional (map_cell0.changed): 'map_cell0' is undefined\n\nThe error appears to have been in '/usr/sha
olla-ansible/ansible/roles/nova/tasks/simple_cell_setup.yml': line 14, column 3, but may\nbe elsewhere in the file
ending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n- include: bootstrap_service.yml\n
re\n"}
        to retry, use: --limit @/usr/share/kolla-ansible/ansible/site.retry

[Doug Szumski (dszumski)]

Possible fix: https://review.openstack.org/583531

Possibly related to Ansible 2.6:

`[vagrant@operator]$ ansible --version
ansible 2.6.1
  config file = /home/vagrant/.ansible.cfg
  configured module search path = [u'/home/vagrant/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python2.7/site-packages/ansible
  executable location = /usr/bin/ansible
  python version = 2.7.5 (default, Jul 13 2018, 13:06:57) [GCC 4.8.5 20150623 (Red Hat 4.8.5-28)]
`

[Jeffrey Zhang (jeffrey4l)]

This should fix all the similar issue

https://review.openstack.org/584728

[OpenStack Infra (hudson-openstack)]

Change abandoned by Doug Szumski (<email address hidden>) on branch: master
Review: https://review.openstack.org/583531
Reason: This is no longer an issue.