- correct for dbapi not present in some tests
- correct for dbapi not present in some tests

Change-Id: Iaa81a00658060d40add26c95cc69cee7edd5966a

wujuguang/sqlalchemy,monetate/sqlalchemy,graingert/sqlalchemy,graingert/sqlalchemy,j5int/sqlalchemy,sqlalchemy/sqlalchemy,monetate/sqlalchemy,zzzeek/sqlalchemy,j5int/sqlalchemy,wujuguang/sqlalchemy