pgsql: Ensure that CREATE TABLE LIKE copies any NO INHERIT constraint p

Ensure that CREATE TABLE LIKE copies any NO INHERIT constraint property.

Since the documentation about LIKE doesn't say that a copied constraint
has properties different from the original, it seems that ignoring
a NO INHERIT property doesn't meet the principle of least surprise.
So make it copy that.

(Note, however, that we still don't copy a NOT VALID property;
CREATE TABLE offers no way to do that, plus it seems pointless.)

Arguably this is a bug fix; but no back-patch, as it seems barely
possible somebody is depending on the current behavior.

Ildar Musin and Chris Travers; reviewed by Amit Langote and myself

Discussion: https://postgr.es/m/CAONYFtMC6C+3AWCVp7Yd8H87Zn0GxG1_iQG6_bQKbaqYZY0=-g@mail.gmail.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/cacef172237fd3426b578f81b7414c0de56cbaaf

Modified Files
--------------
src/backend/parser/parse_utilcmd.c | 11 +++++++----
src/test/regress/expected/create_table_like.out | 16 ++++++++++++++++
src/test/regress/sql/create_table_like.sql | 11 +++++++++++
3 files changed, 34 insertions(+), 4 deletions(-)