Horizon ignores external theme templates

[Gary W. Smith]

When a custom theme resides outside of the openstack_dashboard directory tree, horizon silently ignores all html template files contained within. This bug was introduced by the fix for bug 1582298, which altered the Theme Template loader.

[Akihiro Motoki (amotoki)]

I think this potentially breaks existing deployments, so set the priority to High.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/453919
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=d5306eccf4ec17b523ae6832608a00edf3755b43
Submitter: Jenkins
Branch: master

commit d5306eccf4ec17b523ae6832608a00edf3755b43
Author: Gary Smith <email address hidden>
Date: Wed Apr 5 15:19:55 2017 -0700

    Restore the ability to load external templates

    Change the Theme Template loader to not absolutely require that
    templates reside under the Django directory (openstack_dashboard), by
    deferring the usage of safe_join to the point where that check is
    made and handled correctly.

    Also addressed on Pythonic nit noted in the review of
    https://review.openstack.org/317051

    Closes-Bug: #1680265
    Change-Id: Icf86df5e213d47b207e99b721e9e0fcdc898882e

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/horizon 12.0.0.0b2 development milestone.