Modal dialog with tab containers needs some styling

[Aaron Sahlin]

There are a couple of small styling issues with the Modal Dialogs.

1) The tabbed content needs to be shifted down
2) The white space above / below header needs to be reduced. Lots of wasted space. This applys to all dialogs.
3) Membership widgets '+' buttons are over-sized and overrun row boundaries. This doesn't apply only to just dialogs.

Attached and image for clarity.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/113519

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/113519
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=4e9b5c2daadcaecd48554e3298983961e648e26e
Submitter: Jenkins
Branch: master

commit 4e9b5c2daadcaecd48554e3298983961e648e26e
Author: Jiri Tomasek <email address hidden>
Date: Wed Nov 19 17:38:24 2014 +0100

    Modal fixes - 2 columns, padding, header, membership

    Adds padding to tab-content which takes care of proper
    spacing between tabs and tab-content.
    refactors tabs styling - match modal and non-modal tabs
    Changes modal header h3 margin to save space.
    Cleans up Membership widget styling
    Unifies 2 column layout in modals using bootstrap columns
    Changes create and update image modal template as an example.
    The rest of the views is changed in subsequent patch

    Closes-Bug: #1354505
    Change-Id: Idca2a2dbdea8cdacc37061faa52004b1020b1bf0