Fix pg_dump to dump shell types.

Per discussion, it really ought to do this.  The original choice to
exclude shell types was probably made in the dark ages before we made
it harder to accidentally create shell types; but that was in 7.3.

Also, cause the standard regression tests to leave a shell type behind,
for convenience in testing the case in pg_dump and pg_upgrade.

Back-patch to all supported branches.

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