Logs out the user if he is logged in. Then redirects to the log-in page.
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Switches an authenticated user from one project to another.
Switches the user’s keystone provider using K2K Federation
If keystone_provider is given then we switch the user to the keystone provider using K2K federation. Otherwise if keystone_provider is None then we switch the user back to the Identity Provider Keystone which a non federated token auth will be used.