Fixes for pg8000 for test/orm/test_dynamic.py
Fixes for pg8000 for test/orm/test_dynamic.py

Akrog/sqlalchemy,ThiefMaster/sqlalchemy,bootandy/sqlalchemy,276361270/sqlalchemy,davidjb/sqlalchemy,hsum/sqlalchemy,epa/sqlalchemy,bdupharm/sqlalchemy,dstufft/sqlalchemy,WinterNis/sqlalchemy,bdupharm/sqlalchemy,wfxiang08/sqlalchemy,olemis/sqlalchemy,olemis/sqlalchemy,graingert/sqlalchemy,pdufour/sqlalchemy,sandan/sqlalchemy,zzzeek/sqlalchemy,sandan/sqlalchemy,wujuguang/sqlalchemy,EvaSDK/sqlalchemy,davidfraser/sqlalchemy,halfcrazy/sqlalchemy,halfcrazy/sqlalchemy,bootandy/sqlalchemy,brianv0/sqlalchemy,j5int/sqlalchemy,sqlalchemy/sqlalchemy,inspirehep/sqlalchemy,Akrog/sqlalchemy,epa/sqlalchemy,graingert/sqlalchemy,davidjb/sqlalchemy,itkovian/sqlalchemy,davidfraser/sqlalchemy,itkovian/sqlalchemy,ThiefMaster/sqlalchemy,wfxiang08/sqlalchemy,276361270/sqlalchemy,EvaSDK/sqlalchemy,monetate/sqlalchemy,robin900/sqlalchemy,elelianghh/sqlalchemy,wujuguang/sqlalchemy,hsum/sqlalchemy,brianv0/sqlalchemy,elelianghh/sqlalchemy,inspirehep/sqlalchemy,robin900/sqlalchemy,j5int/sqlalchemy,WinterNis/sqlalchemy,monetate/sqlalchemy,pdufour/sqlalchemy,dstufft/sqlalchemy