Remove erroneous skip message
Remove erroneous skip message

The logic here seems to try to say something different when
__backend__ is True but it produces a nonsensical message,
since __only_on__ doesn't tell us about the implementation
we are actually running.

Change-Id: I14e20cadcba975f8efe8fdefa439c8b8c480b3ed

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