postgres_fdw: When sending ORDER BY, always include NULLS FIRST/LAST.

postgres_fdw: When sending ORDER BY, always include NULLS FIRST/LAST.

Previously, we included NULLS FIRST when appropriate but relied on the
default behavior to be NULLS LAST.  This is, however, not true for a
sort in descending order and seems like a fragile assumption anyway.

Report by Rajkumar Raghuwanshi.  Patch by Ashutosh Bapat.  Review
comments from Michael Paquier and Tom Lane.