Logout from a google property stops the autologin and causes ISE on sso dashboard logout

[viorelaioia-zz]

STR:

1. Login to sso.mozilla.com with LDAP
2. Click "Gmail" app - autologin with LDAP to gmail app is performed
3. Logout from Gmail
4. Click another app from the dashboard (e.g "Mana")

Expected results:
User is autologged into Mana

Actual results:
Nlx is shown, with the available login options.
If trying to log out from sso dashboard, "Internal server error" page is returned.

**Note: **
This is happening for the other Google properties also: Google Calendar, Google Drive

[andrewkrug]

@hidde looks like we need a little javascript on the /dashboard url to follow the 302 if the user federated logs out in another tab.