Use Galera cluster for the CMS database backend

[ericras]

Need to update modules so that db tables have primary keys

Full list of tables with no primary key:

• exif_custom_mapped_fields, done inside /var/www/htdocs/sites/unl.edu.university-communications.digital-photo-archive/modules/
• exif_custom_users,
• form_builder_cache, 475eb66
• forum_index, 5bb5eaf
• honeypot_user, b9457d4
• masquerade, 01a7e4b
• taxonomy_index, 96de392
• workbench_moderation_transitions, 9b6bb2b
• wysiwyg_user dd874f0

[ericras]

This is going to be the big one:
Taxonomy: https://www.drupal.org/project/drupal/issues/610076

[ericras]

Taxonomy is going to need testing.

My inclination is to disable and remove Forum. It's enabled on a bunch of sites but I don't think any one has ever used it, in part because its not styled and kinda ugly.

[ericras]

Needs deployment still