[Launch Instance Fix] improve step subtitle styling

[Brian Tully]

In the Launch Instance Wizard, each step contains a section title and subtitle. The title is absolutely positioned and doesn't scroll with the content. It has a set height and a bottom border. The subtitle appears below the title and horizontal rule, however there is not enough whitespace between the subtitle and the title's bottom border, resulting in poor design. We should give the subtitle some padding-top whitespace to improve the design and make it match the mockups

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/166339

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/166339
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=29a0665b06b7eb3ae2b5a442520df75a7796afeb
Submitter: Jenkins
Branch: master

commit 29a0665b06b7eb3ae2b5a442520df75a7796afeb
Author: Brian Tully <email address hidden>
Date: Fri Mar 20 14:37:10 2015 -0400

    Improve Launch Instance step subtitle styling

    This patch adds whitespace between the subtitle and the title's bottom
    border to improve the design and make it match the mockups

    Closes-Bug: 1434613
    Change-Id: I5f30e352869376ccdb6a0ddb5c72869a331ccefd