Remove PostgreSQL::Test::Utils::perl2host completely

Andrew Dunstan <andrew@dunslane.net>

Commit: 95d981338b241ce1d1b2346cfe2df509bb7243ca
Author: Andrew Dunstan <andrew@dunslane.net>
Date: 2022-02-20T16:51:45Z
Releases: 15.0
Remove PostgreSQL::Test::Utils::perl2host completely

Commit f1ac4a74de disabled this processing, and as nothing has broken (as
expected) here we proceed to remove the routine and adjust all the call
sites.

Backpatch to release 10

Discussion: https://postgr.es/m/0ba775a2-8aa0-0d56-d780-69427cf6f33d@dunslane.net
Discussion: https://postgr.es/m/20220125023609.5ohu3nslxgoygihl@alap3.anarazel.de

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