Get Launchpad team information from SSO

Get Launchpad team information from SSO

teams.py is copied verbatim from django-openid-auth.  django-openid-auth
cannot be added as a requirement, because that would introduce a dependency on
django.  I've emailed Anthony Lenton to see if we can come up with a better
long-term solution.

In order to use the teams extension, UbuntuSSOConsumer is introduced.  This
also allows us to specify the identifier directly, simplifying our login URLs.
Since the teams extension requires us to specify which teams we care about,
I've specified 'charmers'.

Since AuthTktAuthenticationPolicy wants its callback to return a list of
principals, and since principals can be users or groups, I've tweaked the
naming of UserMgr.auth_groupfinder.  It prefixes user ids with 'user ' and
Launchpad team ids with 'group '.

As a drive-by, dev-ingest is updated to use the correct python location.

https://code.launchpad.net/~abentley/charmworld/sso/+merge/141942

(do not edit description out of merge proposal)

[abentley-home, 2013-01-04 15:45:40]

Please take a look.

[hazmat, 2013-01-04 16:18:59]

looks good, land with changes.

https://codereview.appspot.com/7030063/diff/1/charmworld/teams.py
File charmworld/teams.py (right):

https://codereview.appspot.com/7030063/diff/1/charmworld/teams.py#newcode1
charmworld/teams.py:1: # Launchpad OpenID Teams Extension support for
python-openid
can you note as a prefix header the original source to this file (and its copy
date), i assume we're not pulling tests due to django deps?

https://codereview.appspot.com/7030063/diff/1/charmworld/ubuntusso.py
File charmworld/ubuntusso.py (right):

https://codereview.appspot.com/7030063/diff/1/charmworld/ubuntusso.py#newcode24
charmworld/ubuntusso.py:24: name='ubuntu_sso'):
the name parameter doesn't seem to be configurable as the lookup key is
hardcoded at usage, ie. should probably just be a constant and referenced as
such for the def/registration here and consumers elsewhere.