Comment 3 for bug 1555415

Reviewed: https://review.openstack.org/459908
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=2415d5ea59a465881e10ec5a02da5d52b64d8a58
Submitter: Zuul
Branch: master

commit 2415d5ea59a465881e10ec5a02da5d52b64d8a58
Author: gugl <email address hidden>
Date: Tue Apr 25 18:14:57 2017 -0700

    Added error msg when gets redirect to login page

    This checkin includes the followings:

    1.Added an error toast message when user gets
    unauthorized 401 or 404 error during operation.

    2.When the modal dialog shows up, it also adds an error
    message at the top of the dialog.

    3.Also added some unit tests to let the coverage passes
    the threshold.

    Change-Id: I5e0962937932a21565d374561f09f98013063a4f
    Closes-bug: #1555415