Clean with truncation at the start of each suite.
Clean with truncation at the start of each suite.

This keeps things working properly for mongo which does not support
transactions. The strategy is still properly configured to use
transactions where supported, though, so this should not affect
the speed of the test suite for other ORMs.

bsboris/kaminari,mrstif/cursor,varvet/kaminari,sr-education/kaminari,JuanitoFatas/kaminari,danimashu/kaminari,pat/kaminari,sr-education/kaminari,sachin21/kaminari,mperrando/kaminari,peter-umb/umbie_kaminari,Boomkat/kaminari,bonekost/kaminari,sideci-sample/sideci-sample-kaminari,yui-knk/kaminari,joe1chen/kaminari,sanrodari/kaminari,sachin21/kaminari,barkbox/cursor,aelogica/kaminari,thiagorp/kaminari,pat/kaminari,sendgrid/kaminari,parity/kaminari,iberianpig/kaminari,mrhead/kaminari,royels/kaminari,guodongme/kaminari,Teino1978-Corp/Teino1978-Corp-kaminari,onursarikaya/kaminari,yui-knk/kaminari,sendgrid/kaminari,amatsuda/kaminari,jcoyne/kaminari,guodongme/kaminari,dblock/kaminari,sendgrid/kaminari,peter-umb/umbie_kaminari,antstorm/kaminari,kaminari/kaminari,royels/kaminari,danimashu/kaminari,plribeiro3000/kaminari,fkagami/kaminari,mrhead/kaminari,dblock/kaminari,varvet/kaminari,aelogica/kaminari,kaminari/kaminari,epicagency/kaminari,joe1chen/kaminari,bonekost/kaminari,JuanitoFatas/kaminari,thiagorp/kaminari,mperrando/kaminari,antstorm/kaminari,wkirschbaum/kaminari,sanrodari/kaminari,Boomkat/kaminari,Zhomart/kaminari,onursarikaya/kaminari,amatsuda/kaminari,iberianpig/kaminari,bsboris/kaminari,wkirschbaum/kaminari,plribeiro3000/kaminari,Zhomart/kaminari,parity/kaminari,jiamaozheng/kaminari,epicagency/kaminari,jiamaozheng/kaminari,Teino1978-Corp/Teino1978-Corp-kaminari