add detailed message to transport exception
add detailed message to transport exception

spladug/thriftpy,OctavianLee/thriftpy,keitheis/thriftpy,duydb2/thriftpy,duydb2/thriftpy,dan-blanchard/thriftpy,spladug/thriftpy,mariusvniekerk/thriftpy,importcjj/thriftpy,eleme/thriftpy,adsharma/flattools,maralla/thriftpy,adsharma/flattools,itnihao/thriftpy,misakwa/thriftpy,keitheis/thriftpy,eleme/thriftpy,importcjj/thriftpy,dan-blanchard/thriftpy,maralla/thriftpy,OctavianLee/thriftpy,misakwa/thriftpy,duydb2/thriftpy,OctavianLee/thriftpy,mariusvniekerk/thriftpy,itnihao/thriftpy,halfcrazy/thriftpy,adsharma/flattools,itnihao/thriftpy,halfcrazy/thriftpy,mariusvniekerk/thriftpy,misakwa/thriftpy,maralla/thriftpy