[HACKERS] foreign partition DDL regression tests

Ashutosh Bapat pointed out [0] that regression tests are missing for the
foreign partition DDL commands.  Attached patch takes care of that.

Thanks,
Amit

[0]
https://www.postgresql.org/message-id/CAFjFpRcrdzBRj0cZ%2BJAQmfSa2Tv8wSEcWAeYtDpV-YZnNna2sA%40mail.gmail.com

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