[keycloak-dev] keycloak.js and iframe caching issues

[Stian Thorgersen]

When keycloak.js and the session iframe are updated that can cause issues
as they are currently cached by the browser. This is now changed and unless
keycloak.js is loaded with ?version=<KC VERSION> they will no longer be
cached. If you load keycloak.js with ?version<KC VERSION> it will
automatically load the iframe with the same query param which makes that
cached as well.