Further unify ROLE and USER command grammar rules

Peter Eisentraut <peter_e@gmx.net>

Commit: b3744812215de458c80629c3a9c57f00833de8a9
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2017-08-04T00:34:45Z
Releases: 10.0
Further unify ROLE and USER command grammar rules

ALTER USER ... SET did not support all the syntax variants of ALTER ROLE
...  SET.  Fix that, and to avoid further deviations of this kind, unify
many the grammar rules for ROLE/USER/GROUP commands.

Reported-by: Pavel Golub <pavel@microolap.com>

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