Allow background workers to bypass datallowconn

Magnus Hagander <magnus@hagander.net>

Commit: eed1ce72e1593d3e8b7461d7744808d4d6bf402b
Author: Magnus Hagander <magnus@hagander.net>
Date: 2018-04-05T17:02:45Z
Releases: 11.0
Allow background workers to bypass datallowconn

THis adds a "flags" field to the BackgroundWorkerInitializeConnection()
and BackgroundWorkerInitializeConnectionByOid(). For now only one flag,
BGWORKER_BYPASS_ALLOWCONN, is defined, which allows the worker to ignore
datallowconn.

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