Disable parallel query by default.

Robert Haas <rhaas@postgresql.org>

Commit: f85b1a84152f7bf019fd7a2c5eede97867dcddbb
Author: Robert Haas <rhaas@postgresql.org>
Date: 2016-08-16T12:09:15Z
Releases: 9.6.0
Disable parallel query by default.

Per discussion, set the default value of max_parallel_workers_per_gather
to 0 in 9.6 only.  We'll leave it enabled in master so that it gets
more testing and in the hope that it can be enable by default in v10.

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Documentation touched