Allow ProtocolError from inside state machine func
Allow ProtocolError from inside state machine func

bhavishyagopesh/hyper-h2,python-hyper/hyper-h2,vladmunteanu/hyper-h2,Kriechi/hyper-h2,Kriechi/hyper-h2,vladmunteanu/hyper-h2,mhils/hyper-h2,python-hyper/hyper-h2