formatter: format record extra context fix

* Fixes issue where certain format_record() method would not
  accept the extra_context keyword argument.

Signed-off-by: Lars Holm Nielsen <lars.holm.nielsen@cern.ch>
formatter: xm hidden tags fix

* Fixes issue where hidden tags was not filtered out in xm format due
  to that user info was not passed to the format_record function.

Signed-off-by: Lars Holm Nielsen <lars.holm.nielsen@cern.ch>