Minor fixes for test_bitmapset.c

1. Make it so test_random_operations() can accept a NULL to have the
   function select a random seed.
2. Widen the seed parameter of test_random_operations() to bigint.
   Without that, it'll be impossible to run the function with a seed
   which was selected by GetCurrentTimestamp(), and if a randomly
   selected seed ever results in a failure, we'll likely want to run
   with the same seed to debug the issue.
3. Report the seed in the error messages in test_random_operations().
   If the buildfarm were ever to fail there, we'd certainly want to know
   what this was.
4. Add CHECK_FOR_INTERRUPTS() to test_random_operations().  Someone might
   run with a large num_ops and they'd have no way to cancel the query.
5. Minor cosmetic fixes; header order and whitespace issue.

To allow #1, the STRICT modifier had to be removed.  The additional
prechecks were added as I didn't see how else to handle someone passing
those parameters as NULL.

Author: David Rowley <[email protected]>
Reviewed-by: Greg Burd <[email protected]>
Discussion: 
https://postgr.es/m/caaphdvrdw9w72var7h7xecu7+qz-_vff02q+rppuvem0qf0...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/5142f0093e648d1a32fdcc7c835d17fa103e1239

Modified Files
--------------
.../test_bitmapset/expected/test_bitmapset.out     |  2 +-
.../modules/test_bitmapset/sql/test_bitmapset.sql  |  2 +-
.../modules/test_bitmapset/test_bitmapset--1.0.sql |  4 +--
src/test/modules/test_bitmapset/test_bitmapset.c   | 42 +++++++++++++++++-----
4 files changed, 37 insertions(+), 13 deletions(-)

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