Disable cache as it's not working

Conflicts:
	project-integrations/aerogear-ups/auth-server/src/main/webapp/WEB-INF/keycloak-server.json
	server/src/main/resources/META-INF/keycloak-server.json
	testsuite/tools/src/main/resources/META-INF/keycloak-server.json
Refactor to prepar for splitting model
Return null for selected provider if empty string
Merge pull request #484 from stianst/master

Refactor to KeycloakSession