Clean up list of external dialects
Clean up list of external dialects

Fixes: #5190
Change-Id: I3636eeda08bfaa882477397a4cd8064820d25356

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