Remove no-longer-needed fields of Hash plan nodes.

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

Commit: f6747434873693e001737ca06c30dcbcc2320b20
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2017-05-14T15:07:40Z
Releases: 10.0
Remove no-longer-needed fields of Hash plan nodes.

skewColType/skewColTypmod are no longer used in the wake of commit
9aab83fc5, and seem unlikely to be wanted in future, so let's drop 'em.

Discussion: https://postgr.es/m/16364.1494520862@sss.pgh.pa.us

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