Don't disallow dropping NOT NULL for a list partition key.

Robert Haas <rhaas@postgresql.org>

Commit: e28b1156122f4d48d6f6f7a7f26381ee7af65a91
Author: Robert Haas <rhaas@postgresql.org>
Date: 2017-02-14T17:13:41Z
Releases: 10.0
Don't disallow dropping NOT NULL for a list partition key.

Range partitioning doesn't support nulls in the partitioning columns,
but list partitioning does.

Amit Langote, per a complaint from Amul Sul

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