pgsql: Don't create relfilenode for relations without storage

Don't create relfilenode for relations without storage

Some relation kinds had relfilenode set to some non-zero value, but
apparently the actual files did not really exist because creation was
prevented elsewhere. Get rid of the phony pg_class.relfilenode values.

Catversion bumped, but only because the sanity_test check will fail if
run in a system initdb'd with the previous version.

Reviewed-by: Kyotaro HORIGUCHI, Michael Paquier
Discussion: https://postgr.es/m/20181206215552.fm2ypuxq6nhpwjuc@alvherre.pgsql

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/807ae415c54628ade937cb209f0fc9913e6b0cf5

Modified Files
--------------
src/backend/catalog/heap.c | 32 +++++++++++-------------------
src/backend/utils/cache/relcache.c | 4 ++++
src/include/catalog/catversion.h | 2 +-
src/include/utils/rel.h | 9 ++++-----
src/test/regress/expected/sanity_check.out | 9 +++++++++
src/test/regress/sql/sanity_check.sql | 6 ++++++
6 files changed, 36 insertions(+), 26 deletions(-)