horizon/workflows/base.py contains add_error() which conflicts with Django 1.7 definition

[Thomas Goirand]

As per the subject, horizon/workflows/base.py contains a definition of add_error(). Unfortunately, this now a function name used by Django 1.7. This conflicts with it, and leads to unit test errors when running with Django 1.7 installed

[Brad Pokorny (bpokorny)]

This change has been submitted to fix this bug:
https://review.openstack.org/#/c/111930

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/111930
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=04dd1568c1c927901085941124e4c6852183f4f0
Submitter: Jenkins
Branch: master

commit 04dd1568c1c927901085941124e4c6852183f4f0
Author: Thomas Goirand <email address hidden>
Date: Tue Aug 5 14:50:06 2014 +0800

    Rename add_error methods: Django 1.7 conflict

    In Django 1.7, Forms have an add_error() method and our definition
    was conflicting with Django's method. Thanks to <email address hidden>
    for the patch.

    Close-bug: #1352919
    Change-Id: I1f558cf7f3198a68629738a011e9cae0c3749320

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/112630
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=ad2d4281a38c168747c2bbe42513af72d4d7d0bd
Submitter: Jenkins
Branch: stable/icehouse

commit ad2d4281a38c168747c2bbe42513af72d4d7d0bd
Author: Thomas Goirand <email address hidden>
Date: Tue Aug 5 14:50:06 2014 +0800

    Rename add_error methods: Django 1.7 conflict

    In Django 1.7, Forms have an add_error() method and our definition
    was conflicting with Django's method. Thanks to <email address hidden>
    for the patch.

    Note that it is required to support Django 1.7 in Icehouse, because
    we're planning to release Debian Jessie with both Django 1.7 and
    Icehouse. This is to *support* Django 1.7, not at all to *switch* to
    it, which is very different.

    Close-bug: #1352919
    Change-Id: I1f558cf7f3198a68629738a011e9cae0c3749320
    (cherry picked from commit 04dd1568c1c927901085941124e4c6852183f4f0)