Review uses of IsUnderPostmaster, change some tests to look at

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

Commit: 2f0d43b251f5bfc257d45835965861202fcd263b
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2004-01-28T21:02:40Z
Releases: 8.0.0
Review uses of IsUnderPostmaster, change some tests to look at
whereToSendOutput instead because they are really inquiring about
the correct client communication protocol.  Update some comments.
This is pointing towards supporting regular FE/BE client protocol
in a standalone backend, per discussion a month or so back.

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