Centralize code for interpreting schema references, which had gotten

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

Commit: b5eebc1fd4ebfe91f9a014af7c7ec739336ca02d
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2002-07-29T23:46:35Z
Releases: 7.3.1
Centralize code for interpreting schema references, which had gotten
copied more places than I first thought it would.  This fixes a bug:
a couple of these places were neglecting to enforce USAGE access on
explicitly-referenced schemas.

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