Get rid of hashkeys field of Hash plan node, since it's redundant with

Tom Lane <tgl@sss.pgh.pa.us>

Commit: a64846f3ada1a4ecc6ca8123777217b3c7781160
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2003-11-25T21:00:54Z
Releases: 8.0.0
Get rid of hashkeys field of Hash plan node, since it's redundant with
the hashclauses field of the parent HashJoin.  This avoids problems with
duplicated links to SubPlans in hash clauses, as per report from
Andrew Holm-Hansen.

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