Make use of RELKIND_HAS_STORAGE() where appropriate, instead of
listing out the relkinds individually.  No behavior change intended.
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://www.postgresql.org/message-id/flat/7a22bf51-2480-d999-1794-191ba67ff47c%402ndquadrant.com