Check input for Log length

Check input for Log length to make sure the input is a nonnegative
integer.

Change-Id: Iae3dbf4236f1c7ceb8260540dd4f9086349bc13a
Closes-bug: 1331624
Updated description of update user form

The update user form does not allow to change the role
of the user. So, removed it from the description of the
update user form.

Change-Id: I3f57ece2656a0131982ad9d9fe16131a502741a0
Closes-bug: #1401822
Base Glance Metadata Definitions Admin UI

Provide a base admin UI for viewing, importing, and associating the
metadata definitions that can be used with various resource types
such as flavors, images, and host aggregates.

In Juno, Glance provided a metadata definitions catalog[1][2] where
users can register the available metadata definitions that can be used
on different types of resources (images, artifacts, volumes, flavors,
aggregates, etc). This includes key / value pairs such as
properties, extra specs, etc. Horizon landed several patches that
read these properties. You can view the functionality in the
"update metadata" action on Flavors, Images, and Host Aggregates.

This specific patch is to bring in the Admin UI for the basic coarse
grained actions on the definitions in the catalog. This includes creating
(importing) a namespace, viewing the overview details about
it, deleting the namespace, and associating the namespace for use with
specific resource types.

Future blueprints will be registered for:
 - CRUD on individual metadata definitions within the namespace
For example, editing the default value of an individual property.

[1] Approved Glance Juno Spec:
https://github.com/openstack/glance-specs/blob/master/specs/juno/metadata-schema-catalog.rst

[2] Glance PTL Juno Feature Overview:
https://www.youtube.com/watch?v=3ptriiw1wK8&t=14m27s

Co-Authored-By: Travis Tripp <travis.tripp@hp.com>
Co-Authored-By: Santiago Baldassin<santiago.b.baldassin@intel.com>
Co-Authored-By: Bartosz Fic <bartosz.fic@intel.com>
Co-Authored-By: Pawel Koniszewski <pawel.koniszewski@intel.com>
Co-Authored-By: Michal Dulko <michal.dulko@intel.com>
DocImpact: Concept awareness
Change-Id: Ie34007f73af7e0941631a52f03841068e509a72c
Implements: blueprint glance-metadata-definitions-base-admin-ui
Imported Translations from Transifex

For more information about this automatic import see:
https://wiki.openstack.org/wiki/Translations/Infrastructure

Change-Id: I11e8aa0c6538df3dc9b2f1c1b002a7d2e034b45c
Merge "Check input for Log length"
Updated from global requirements

Change-Id: I02454508080efe8c79fac4cfebe83585b75121ac
Merge "Base Glance Metadata Definitions Admin UI"
Merge "Imported Translations from Transifex"
Merge "Updated description of update user form"
Merge "Updated from global requirements"
Imported Translations from Transifex

For more information about this automatic import see:
https://wiki.openstack.org/wiki/Translations/Infrastructure

Change-Id: I11e2dc4721629e212fba0dab94ddcc1e17568d0b
Merge branch 'master' of https://github.com/openstack/horizon

Conflicts:
	openstack_dashboard/dashboards/admin/dashboard.py