Updated openstack/openstack
Project: openstack/horizon  26fae84a7e42d825fcbbfd6911625df400be7528

Reorganize variables to enable overriding

This patch enables scss variables to be overriden. It also cleans up unnecessary variables
defined in _variables.scss because of previous wrong overriding.
More details on

Closes-Bug: 1390101
Change-Id: I5078fe46ea6a992a096e2e23118a20cb199b7942