Remove selenium dependency when not using selenium tests

Closes-Bug: 1377372
Change-Id: I6a493989d7280eaa2a1c999a9d1be4365aa77d52
Improve sub-navigation styling

Change-Id: Iae11b46f2e5b340e2c69f812d4f09f390d018749
Closes-bug: #1378568
Co-Authored by: Jiri Tomasek <jtomasek@redhat.com>
Pass correct project ID to get tenant_usages

The current implementation of tenant_quota_usages did not allow for
queries regarding projects that were not the currently active project,
this meant that when an admin went to edit or create a project it tried
to verify the usages against the wrong project. This patch adds the
code for passing a project id to the tenant_quota_usages function so
that the usages can be fetched for a specific project, as well as
removes the need for usage validation on creation of a new project.

Change-Id: I3ec84d14c8be7e3aae066119e963c4093f8aa345
Closes-Bug: 1380701
Merge "Pass correct project ID to get tenant_usages"
Merge "Improve sub-navigation styling"
Merge "Remove selenium dependency when not using selenium tests"
Merge branch 'master' of https://github.com/openstack/horizon