remote_attr and local_attr refer to class bound attributes, not MapperProperty
remote_attr and local_attr refer to class bound attributes, not
MapperProperty

Change-Id: If5fee69474f295e8c4bef891f5360f6b54080bbf

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