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renamed foreign key table definition constraint issue #518

Description

@ixcat

defining a renamed foreign key reference to a partial key defined in:

class Animal(dj.Manual):
    definition = """
    animal_id : char(16)
    datasource_id=0: int
    ---
    animal_species: varchar(16)
    animal_name: varchar(128)
    animal_sex: ENUM('M', 'F', 'U')
    animal_dob=NULL: date
    -> AnimalColor
    """

via:

@schema
class Dam(dj.Manual):
    definition = """
    -> Animal
    (dam_id) -> Animal(animal_id)
    """

yields:

CREATE TABLE IF NOT EXISTS `tutorial_mlims_prod_ephys`.`dam` ( `animal_id` char(16) NOT NULL COMMENT "", `datasource_id` int NOT NULL COMMENT "", `dam_id` int NOT NULL COMMENT "", PRIMARY KEY (`animal_id`,`datasource_id`,`dam_id`), FOREIGN KEY (`animal_id`,`datasource_id`) REFERENCES `tutorial_mlims_prod_ephys`.`animal` (`animal_id`,`datasource_id`) ON UPDATE CASCADE ON DELETE RESTRICT, FOREIGN KEY (`datasource_id`,`dam_id`) REFERENCES `tutorial_mlims_prod_ephys`.`animal` (`animal_id`,`datasource_id`) ON UPDATE CASCADE ON DELETE RESTRICT ) ENGINE=InnoDB, COMMENT "";

and therefore this:

#517 code resolves issue.

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