Branding: Padding around Nav Icons Needs Fixing

[Diana Whitten]

The padding around the Top Nav Bar's Dropdown Icons have been done with actual text spaces, instead of relying on padding that is set via css. This makes it very difficult to customize the padding around these elements at a global level.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/271888

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/271888
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=4b5886d2764ccc05ab9e41b94cda9cdf4f16e2fa
Submitter: Jenkins
Branch: master

commit 4b5886d2764ccc05ab9e41b94cda9cdf4f16e2fa
Author: Diana Whitten <email address hidden>
Date: Sun Jan 24 21:10:56 2016 -0700

    Branding: Nav icon spacing should use css

    The padding around the Top Nav Bar's Dropdown Icons have been done
    with actual text spaces, instead of relying on padding that is set
    via css. This makes it very difficult to customize the padding
    around these elements at a global level.

    Some contextual classes have been added for ease of branding-level
    customization.

    Change-Id: I6768135351637db8a950a4b44366880817ce2df3
    Closes-bug: #1537608