Skip msg metadata tests on tests.PYPY
Skip msg metadata tests on tests.PYPY

ArvinPan/pyzmq,swn1/pyzmq,ArvinPan/pyzmq,swn1/pyzmq,caidongyun/pyzmq,swn1/pyzmq,dash-dash/pyzmq,dash-dash/pyzmq,caidongyun/pyzmq,ArvinPan/pyzmq,Mustard-Systems-Ltd/pyzmq,yyt030/pyzmq,dash-dash/pyzmq,yyt030/pyzmq,Mustard-Systems-Ltd/pyzmq,yyt030/pyzmq,Mustard-Systems-Ltd/pyzmq,caidongyun/pyzmq