partial poc6 fixes
partial poc6 fixes

changwu-tw/pyethapp,vaporry/pyethapp,danielnovy/test,heikoheiko/pyethapp,gsalgado/pyethapp,changwu-tw/pyethapp,ethereum/pyethapp,ethereum/pyethapp,d-das/pyethapp,gsalgado/pyethapp,RomanZacharia/pyethapp,RomanZacharia/pyethapp,kustomzone/pyethapp