Don't require a user mapping for FDWs to work.

Robert Haas <rhaas@postgresql.org>

Commit: 5d4171d1c70edfe3e9be1de9e66603af28e3afe1
Author: Robert Haas <rhaas@postgresql.org>
Date: 2016-03-29T01:50:28Z
Releases: 9.6.0
Don't require a user mapping for FDWs to work.

Commit fbe5a3fb73102c2cfec11aaaa4a67943f4474383 accidentally changed
this behavior; put things back the way they were, and add some
regression tests.

Report by Andres Freund; patch by Ashutosh Bapat, with a bit of
kibitzing by me.

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