subnet create doesn't show message when network address is omitted

[Doug Fish]

On Admin->System->Networks->[network]->Create Subnet
if the Network address is omitted and Next is clicked, no error message is displayed.

If the Network address "12" is entered and Next is clicked, no error message is displayed.

If the Network address "twelve" is entered and Next is clicked, an error message is displayed, but the formatting is unexpected - field moves to the right, message remains on the left. (see attachment)

Related to bug
https://bugs.launchpad.net/horizon/+bug/1420370 "Subnet Network Address is missing asterisk"

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/172957

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/172957
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=6977239374e9c3f18cfc241e54589dc142dfe4d3
Submitter: Jenkins
Branch: master

commit 6977239374e9c3f18cfc241e54589dc142dfe4d3
Author: Sam Betts <email address hidden>
Date: Mon Apr 13 16:04:05 2015 +0100

    Update JS that adds classes for modal form errors

    The JS that processes json error messages for modal forms was not
    searching for or adding the correct classes to the HTML for display
    the errors. This patch updates the JS so that once processed the
    HTML matches the HTML that is returned in the non-json response of
    the form.

    Change-Id: Ib5ef39d02194ec6c31d69f534831bb0d28e0884c
    Closes-Bug: 1443428