Accept SET SESSION AUTHORIZATION DEFAULT and RESET SESSION AUTHORIZATION

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 282278899379a3a57fbc734bda6a4dc9cec3ce60
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2002-05-06T19:47:30Z
Releases: 7.3.1
Accept SET SESSION AUTHORIZATION DEFAULT and RESET SESSION AUTHORIZATION
to reset session userid to the originally-authenticated name.  Also,
relax SET SESSION AUTHORIZATION to allow specifying one's own username
even if one is not superuser, so as to avoid unnecessary error messages
when loading a pg_dump file that uses this command.  Per discussion from
several months ago.

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