Improve speed of make check-world

Peter Eisentraut <peter_e@gmx.net>

Commit: dcae5faccab64776376d354decda0017c648bb53
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2015-04-23T12:59:52Z
Releases: 9.5.0
Improve speed of make check-world

Before, make check-world would create a new temporary installation for
each test suite, which is slow and wasteful.  Instead, we now create one
test installation that is used by all test suites that are part of a
make run.

The management of the temporary installation is removed from pg_regress
and handled in the makefiles.  This allows for better control, and
unifies the code with that of test suites not run through pg_regress.

review and msvc support by Michael Paquier <michael.paquier@gmail.com>

more review by Fabien Coelho <coelho@cri.ensmp.fr>

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