Wrong url pattern in Horizon tutorial

[Manuel Requena]

I'm following the Horizon tutorial and the definition of the URL pattern in [1] seems to be wrong. The text says:
"Replace the existing url pattern with the following line:
url(r'^\?tab=mypanel_tabs__tab$',
    views.IndexView.as_view(), name='mypanel_tabs'),
"

If I run the test server, I get the following error
Error reversing absolute URL for <Panel: mypanel>: Reverse for 'index' with arguments '()' and keyword arguments '{}' not found. 0 pattern(s) tried: []
...
  File "/var/data/testing-horizon/git-repos/horizon/.venv/local/lib/python2.7/site-packages/django/core/urlresolvers.py", line 456, in _reverse_with_prefix
    (lookup_view_s, args, kwargs, len(patterns), patterns))
NoReverseMatch: Reverse for 'index' with arguments '()' and keyword arguments '{}' not found. 0 pattern(s) tried: []

If I change the url pattern with the following:
    url(r'^$',
        views.IndexView.as_view(), name='index'),

then the new MyDashboard/Mypanel works.

[1] http://docs.openstack.org/developer/horizon/topics/tutorial.html#urls

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/161521

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/161521
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=d76708e62b3d226830d1863afb7006a194a826e6
Submitter: Jenkins
Branch: master

commit d76708e62b3d226830d1863afb7006a194a826e6
Author: Chris Johnson <email address hidden>
Date: Wed Mar 4 16:38:26 2015 -0800

    Fix tutorial to correctly display custom dashboard/panel

    This change fixes a bug in the "Building a Dashboard using
    Horizon" tutorial in the Horizon developer documentation.
    The tutorial shows new Horizon developers how to build a
    custom dashboard and panel that displays running instances.

    In the tutorial, the URL pattern provided fails to display
    the custom dashboard & panel. This change updates the URL
    pattern. The custom dashboard and panel now correctly show
    the custom view of instances data.

    Documentation has been regenerated and reviewed to ensure
    change was correctly done.

    DocImpact
    Closes-Bug: #1427758

    Change-Id: I522825c6d24fcaf0981f5faab273e2efd6e00f1a