Migrate to PBR for build tooling.

pbr is the library-ified version of the code that was in
openstack.common.setup and version. It builds on top of d2to1 to
provide declarative build configuration.

Change-Id: Ic264fa33e17fe5fdc71d8c53412495b069ab74a4
Merge "Migrate to PBR for build tooling."
Update Horizon for Django 1.5 compatibility

Changes made:
- Changed template url tags: {% url myview %} to {% url myview %}
- Import json instead of django.utils.simplejson
- Import django.utils.encoding.force_unicode instead of
  django.utils.translation.force_unicode
- Fixed error in tables/base.py for CheckboxInput, pass a callable
  check_test. Django 1.5 does not silently fail on this now.
- Set SECRET_KEY in test/settingspy, Django 1.5 refuse to start if it
  is not set.
- Added notes about ALLOWED_HOSTS when running Horizon in Production

Fixes bug 1147329

Change-Id: I6ac1e81498f41141dea99760922991feb310a326
Don't duplicate networks list on keypair import

In the Launch Instance modal, if the user clicks on the button to import
a keypair, the networks listed in the Networking tab get duplicated.

The import keypair button calls `workflow_init` which in turn calls
`generate_networklist_html` which appended the networks to the list, not
clearing it beforehand.

This makes sure both Selected Networks and Available Networks lists are
emptied before the networks are added.

Fixes bug 1170193

Change-Id: Icb750caa08673068c509af6c8df1ad57a2a30d93
Signed-off-by: Tomas Sedovic <tomas@sedovic.cz>
Fix translation error for missing default role

Fixes: bug #1175165
Change-Id: Ic3e19b47c5449740bec189f2c3a2e803d22fb5dc
Merge "Fix translation error for missing default role"
Merge "Don't duplicate networks list on keypair import"