Expose image customization for dashboard

[Darren Carpenter]

Currently custom images used for Horizon have to be manually loaded in to the environment post install. I think this option should be presented as an option in user variables maybe? This is not a common request, but one I feel that we should be able to easily take care of when requested.

Steps:

- Edit local_settings.py for HTML TItle
/etc/openstack-dashboard/local_settings.py:
SITE_BRANDING = "Example, Inc. Cloud"

- custom load images from the customer in to;
 /usr/share/openstack-dashboard/openstack_dashboard/static/dashboard/img/

- modify defaults in ubuntu.css
(see http://docs.openstack.org/juno/config-reference/content/dashboard-custom-brand.html)

- add a line to the custom .css in
/usr/share/openstack-dashboard/openstack_dashboard/templates/_stylesheets.html
(see http://docs.openstack.org/juno/config-reference/content/dashboard-custom-brand.html)

- restart apache

[Jean-Philippe Evrard (jean-philippe-evrard)]

FYI, I've a role in ansible-galaxy: https://github.com/evrardjp/ansible-openstack-horizon-branding that can help you with that.
It's currently not included in openstack-ansible.

I'm currently using it in the way mentionned in the docs (http://docs.openstack.org/developer/openstack-ansible/developer-docs/extending.html), by extending openstack-ansible with my own roles.

As this is really openstack related, it's hard to test this role separately, so it's maybe worth including in openstack-ansible.

[Jean-Philippe Evrard (jean-philippe-evrard)]

The role mentionned above isn't complete and should be improved. Don't hesitate to submit a PR.

[Jean-Philippe Evrard (jean-philippe-evrard)]

FYI, this is now possible with os_horizon role, since this commit:
https://github.com/openstack/openstack-ansible-os_horizon/commit/c62b54d891eecd17f50de62415eb8aa7a9b09e09