[keycloak-dev] refactored model for caching

[Bill Burke]

I'm almost done with a caching implementation.  Had to do some 
refactoring though

* Some methods were moved from RealmModel to ClientModel and UserModel. 
  scope mapping methods, role mapping methods, stuff that really belonged

* I moved a lot of queries up to the KeycloakSession interface.  The 
reason I did this is so that a caching layer could make queries without 
having to do a DB query to load a realm, app, client, or whatever.

I wanted to commit this stuff now as I changed a lot of files and didn't 
want tons of merge conflicts after you guys get back.  Hopefully I can 
have a cache working in the next few days.

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