Magnum UI and their panels are currently registered via their `dashboard.py`
and `panel.py` files, but should use the enabled files.
This is standard in Horizon.
This patch changes registration method to enabled files.
For moving our dashboard to under the "project" dashbaord,
we need to change URLs. So, many files will be changed.
Since "/project/containers" is already used by Swift Container panel,
this patch uses "bays", "baymodels" and "bays/containers" for URLs.
Change-Id: Icedb984331bd46540f2e7d12bbefcc308aff214f
Closes-Bug: #1507679
7e5e888481