Reduce the default for max_worker_processes back to 8.

Robert Haas <rhaas@postgresql.org>

Commit: 2b959d4957ff47c77b2518dcddbf3aa126a1593c
Author: Robert Haas <rhaas@postgresql.org>
Date: 2016-12-05T15:53:21Z
Releases: 10.0
Reduce the default for max_worker_processes back to 8.

Commit b460f5d6693103076dc554aa7cbb96e1e53074f9 -- at my suggestion --
increased the default value of max_worker_processes from 8 to 16, on
the theory that this would be harmless and convenient for users.
Unfortunately, this caused some buildfarm machines with low connection
limits to start failing, so apparently it's not harmless after all.

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