Description of problem:
I am running keystone version 2 and in the local_setting of openstack-dashboard its version 2 (OPENSTACK_KEYSTONE_URL = "http://%s:5000/v2.0" % OPENSTACK_HOST) but when i login with admin or user account, it logins but its not showing project list if user is part of multiple projects and unable to switch role and its showing error 401 in error_log of httpd. (log pasted in actual result tab )

I fix the error by changing the openstack api version from 2 to 3

OPENSTACK_API_VERSIONS = {
     "identity": 3
}

 but leaving the endpoint url OPENSTACK_KEYSTONE_URL = v2.0.  <== 


After applying the above the problem is fixed but i can login and browse the project list all the normal tasks  but still getting error in the log: 

[Tue Dec 29 21:59:23.245455 2015] [:error] [pid 4944] Login successful for user "shahid".
[Tue Dec 29 21:59:23.660515 2015] [:error] [pid 4944] The settings.py file points to a v2.0 keystone endpoint, but v3 is specified as the API version to use. Using v3 endpoint for authentication.

( It does not make any sense because i have keystone running as version 2 but the error log is saying using v3 endpoint for authentication and it still works and able to login and can also browse the projects) 

Version-Release number of selected component (if applicable):


How reproducible:
100%

Steps to Reproduce:
1.Set endpoint URL with v2.0
2.Set OPENSTACK_API_VERSIONS = {"identity": 2}
3. Restart http and memcache and try to login the horizon. It will login but unable to browse the project list

Actual results:


[Tue Dec 29 21:43:27.064771 2015] [:error] [pid 4589] Unable to retrieve project list.
[Tue Dec 29 21:43:27.064800 2015] [:error] [pid 4589] Traceback (most recent call last):
[Tue Dec 29 21:43:27.064805 2015] [:error] [pid 4589]   File "/usr/lib/python2.7/site-packages/openstack_auth/user.py", line 316, in authorized_tenants
[Tue Dec 29 21:43:27.064808 2015] [:error] [pid 4589]     is_federated=self.is_federated)
[Tue Dec 29 21:43:27.064811 2015] [:error] [pid 4589]   File "/usr/lib/python2.7/site-packages/openstack_auth/utils.py", line 145, in wrapper
[Tue Dec 29 21:43:27.064814 2015] [:error] [pid 4589]     result = func(*args, **kwargs)
[Tue Dec 29 21:43:27.064818 2015] [:error] [pid 4589]   File "/usr/lib/python2.7/site-packages/openstack_auth/utils.py", line 256, in get_project_list
[Tue Dec 29 21:43:27.064847 2015] [:error] [pid 4589]     projects = client.tenants.list()
[Tue Dec 29 21:43:27.064853 2015] [:error] [pid 4589]   File "/usr/lib/python2.7/site-packages/keystoneclient/v2_0/tenants.py", line 123, in list
[Tue Dec 29 21:43:27.064870 2015] [:error] [pid 4589]     tenant_list = self._list('/tenants%s' % query, 'tenants')
[Tue Dec 29 21:43:27.064890 2015] [:error] [pid 4589]   File "/usr/lib/python2.7/site-packages/keystoneclient/base.py", line 113, in _list
[Tue Dec 29 21:43:27.064916 2015] [:error] [pid 4589]     resp, body = self.client.get(url, **kwargs)
[Tue Dec 29 21:43:27.064921 2015] [:error] [pid 4589]   File "/usr/lib/python2.7/site-packages/keystoneclient/adapter.py", line 170, in get
[Tue Dec 29 21:43:27.064923 2015] [:error] [pid 4589]     return self.request(url, 'GET', **kwargs)
[Tue Dec 29 21:43:27.064926 2015] [:error] [pid 4589]   File "/usr/lib/python2.7/site-packages/keystoneclient/adapter.py", line 206, in request
[Tue Dec 29 21:43:27.064928 2015] [:error] [pid 4589]     resp = super(LegacyJsonAdapter, self).request(*args, **kwargs)
[Tue Dec 29 21:43:27.064942 2015] [:error] [pid 4589]   File "/usr/lib/python2.7/site-packages/keystoneclient/adapter.py", line 95, in request
[Tue Dec 29 21:43:27.064955 2015] [:error] [pid 4589]     return self.session.request(url, method, **kwargs)
[Tue Dec 29 21:43:27.064970 2015] [:error] [pid 4589]   File "/usr/lib/python2.7/site-packages/keystoneclient/utils.py", line 318, in inner
[Tue Dec 29 21:43:27.064980 2015] [:error] [pid 4589]     return func(*args, **kwargs)
[Tue Dec 29 21:43:27.064996 2015] [:error] [pid 4589]   File "/usr/lib/python2.7/site-packages/keystoneclient/session.py", line 397, in request
[Tue Dec 29 21:43:27.065013 2015] [:error] [pid 4589]     raise exceptions.from_response(resp, method, url)
[Tue Dec 29 21:43:27.065023 2015] [:error] [pid 4589] Unauthorized: The request you have made requires authentication. (HTTP 401) (Request-ID: req-433b92f3-b6df-4b9e-ae68-60952917340d)

Expected results:


Additional info:
=================
Dashboard version
==================
Name        : openstack-dashboard
Version     : 2015.1.2
Release     : 4.el7ost
Architecture: noarch
Install Date: Sun 27 Dec 2015 12:13:59 AM GST
Group       : Applications/System
Size        : 26789571
License     : ASL 2.0 and BSD
Signature   : RSA/SHA256, Tue 15 Dec 2015 07:01:17 PM GST, Key ID 199e2f91fd431d51
Source RPM  : python-django-horizon-2015.1.2-4.el7ost.src.rpm
Build Date  : Tue 08 Dec 2015 02:45:34 PM GST
Build Host  : x86-034.build.eng.bos.redhat.com

===================
Keystone Version
===================
Name        : openstack-keystone
Version     : 2015.1.2
Release     : 2.el7ost
Architecture: noarch
Install Date: Sun 27 Dec 2015 12:06:34 AM GST
Group       : Unspecified
Size        : 115305
License     : ASL 2.0
Signature   : RSA/SHA256, Mon 23 Nov 2015 06:46:31 AM GST, Key ID 199e2f91fd431d51
Source RPM  : openstack-keystone-2015.1.2-2.el7ost.src.rpm
Build Date  : Wed 18 Nov 2015 12:13:12 AM GST
Build Host  : x86-034.build.eng.bos.redhat.com