[Labs-l] No nova credentials... bug fixed for most use cases

[Ryan Lane]

I've pushed in a few patches that should kill off the no credentials bug
for all cases except first login for a new account. You may get that error
message one last time, but you shouldn't get it again otherwise. If you see
this error, please let me know.

The bug was reintroduced when we switched to keystone and was triggered by
sessions (and openstack tokens) disappearing from memcache, like in cases
where memcache was restarted. If you had a long-lived token, then you would
receive a new session upon next visit to labsconsole but your openstack
tokens would be gone. I've added some tables to the database that'll save
your ldap domain and your openstack generic token, if you are using a
long-lived token. If your generic token is missing from memcache it'll pull
it from the database.

The bug is still triggered when a new login occurs because authentication
isn't actually triggered on password reset. I'll add a fix for this soon.

- Ryan
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