Restore 2.3 compat for the sharding test
Restore 2.3 compat for the sharding test

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