Designate Horizon UI bits

• Free software: Apache license

• TODO

1. Package the designatedashboard by running:

   python setup.py sdist

   This will create a python egg in the dist folder, which can be used to install on the horizon machine or within horizon's python virtual environment.

2. Modify horizon's settings file to enabled designatedashboard, note the two lines to add below:

   import designatedashboard.enabled    # ADD THIS LINE
   
   ...
   
   INSTALLED_APPS = list(INSTALLED_APPS)  # Make sure it's mutable
   settings.update_dashboards([
      openstack_dashboard.enabled,
      openstack_dashboard.local.enabled,
      designatedashboard.enabled,      # ADD THIS LINE TOO
   ], HORIZON_CONFIG, INSTALLED_APPS)

3. (Optional) Copy the designate policy file into horizon's policy files folder, and add this config:

   'dns': 'designate_policy.json',