Revert "jsonrpc: Accept all stomp commands"

There is no verification whether incoming stomp messages are correct for
correct runtime context. This work is planned for next release. We can
use protocol detection as sanity check so we will recieve only messages
which we know are correct.

This reverts commit 6c2892a2a0bc337dcd4a40da54d08d3d63f95028.

Change-Id: I3aef9781e09cb582e9a5422638b82327974f1213
Signed-off-by: pkliczewski <piotr.kliczewski@gmail.com>
Reviewed-on: http://gerrit.ovirt.org/30033
Reviewed-by: Yaniv Bronhaim <ybronhei@redhat.com>