[keycloak-dev] logout by redirect

[Bill Burke]

* Adding a flag to ClientModel "backchannelLogout"
* Adding a method to LoginProtocol "Response 
redirectLogout(UserSessionModel, ClientSessionModel)"
* Adding a flag to ClientSessionModel "loggedOut" ... or ... rename the 
Action attribute to State and add a "LOGGED_OUT" state.
* Adding a redirectLogout REST endpoint for OIDC.
* Adding a redirectLogout REST endpoint for adapters.

Algorithm will be:
1. do all backchannel logouts
2. Find a logged in client
3. Redirect based on protocol
4. Receive logout success from a redirection, goto 2

-- 
Bill Burke
JBoss, a division of Red Hat
http://bill.burkecentral.com