Log json message without logging stomp part of a frame

We still need to log stmop frames but in debug only. Now we log nicely
looking payload of a request and response.

Bug-Url: https://bugzilla.redhat.com/1124759
Bug-Url: https://bugzilla.redhat.com/1126833
Change-Id: I45154a9aa382dd25f17e80363d2f2c7a4b81f09c
Signed-off-by: pkliczewski <piotr.kliczewski@gmail.com>