Re-enable test_tags

* Refactor of layout-tags.yaml to single-tenant layout config dir.
* Build tags now added as ansible vars rather than env vars.
* Removes old layout config and custom add_tags function.

Change-Id: I1edfa505df7c9cc1a212f9483fe50ac088f1174e
Signed-off-by: Cullen Taylor <cullentaylor@outlook.com>
9 files changed