Removed forgotten and obsolete registerInternalConfig() on Common config parser
Implement EZP-22995: Disable ezfromtoken for lowlevel legacy fallbacks

A usual problem with 5.x is that users gets formtoken exceptions becasue they have
implemented  some form which does not sets the legacy formtoken (in addtion to symfony one).

This improvment tries to reduce the risk of that happening by making sure all low level
runCallbacks used by kernel itself turns of formtoken checking during callback.
Implement EZP-22995: Do not post reinitialize legcy kernel when not needed