When a background worker exists with code 0, unregister it.

Robert Haas <rhaas@postgresql.org>

Commit: be7558162acc5578d0b2cf0c8d4c76b6076ce352
Author: Robert Haas <rhaas@postgresql.org>
Date: 2014-05-07T21:44:42Z
Releases: 9.4.0
When a background worker exists with code 0, unregister it.

The previous behavior was to restart immediately, which was generally
viewed as less useful.

Petr Jelinek, with some adjustments by me.

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