revert cymysql deadlock
revert cymysql deadlock

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