Allow pg_upgrade to honor libpq environment variables. Add 'local'

Bruce Momjian <bruce@momjian.us>

Commit: 6c19bd96bc5139fabace94c5a0a5624fd9d8e986
Author: Bruce Momjian <bruce@momjian.us>
Date: 2011-05-16T14:48:40Z
Releases: 9.1.0
Allow pg_upgrade to honor libpq environment variables.  Add 'local'
checks for PGHOST and PGHOSTADDR.

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