Revert patch adding support for logging the current role.

This reverts commit a8a8867912c46a68c9ac14903b3dba2fab8f7097, committed
by me earlier today (2011-01-12).  This isn't safe inside an aborted
transaction.

Noted by Tom Lane.

Branch
------
master

Details
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http://git.postgresql.org/gitweb?p=postgresql.git;a=commitdiff;h=7a32ff97321408afa0ddfcae1a4a060062956d24

Modified Files
--------------
doc/src/sgml/config.sgml       |    7 +------
src/backend/utils/error/elog.c |   10 ----------
2 files changed, 1 insertions(+), 16 deletions(-)

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Next:	From: Jan Urbański	Date: 2011-01-12 18:57:26
	Subject: Re: autogenerating error code lists (was Re: [COMMITTERS] pgsql: Add foreign data wrapper error code values for SQL/MED.)
Previous:	From: Robert Haas	Date: 2011-01-12 16:41:30
	Subject: pgsql: Add support for logging the current role.