Make selenium tests pass with WebKit

[Kieran Spear]

The inline editing selenium tests aren't handling the behaviour of WebKit
where it makes the text on a focused input field selected. Instead of
prepending some text to the field, the input keys completely replace it.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/94512

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/94512
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=d259ab9945440ba14100b62f78111c581b24e7b4
Submitter: Jenkins
Branch: master

commit d259ab9945440ba14100b62f78111c581b24e7b4
Author: Kieran Spear <email address hidden>
Date: Wed May 21 11:37:29 2014 +1000

    Make selenium tests pass in WebKit

    The inline editing selenium tests aren't handling the behaviour of WebKit
    where it makes the text on a focused input field selected. Instead of
    prepending some text to the field, the input keys completely replace it.

    Fix this by sending the Home key before sending the text.

    Closes-bug: #1321514
    Change-Id: I003bf50eff3eb8ebb53125bfab03caf607e92291