pgsql: Add pg_audit, an auditing extension

Add pg_audit, an auditing extension

This extension provides detailed logging classes, ability to control
logging at a per-object level, and includes fully-qualified object
names for logged statements (DML and DDL) in independent fields of the
log output.

Authors: Ian Barwick, Abhijit Menon-Sen, David Steele
Reviews by: Robert Haas, Tatsuo Ishii, Sawada Masahiko, Fujii Masao,
Simon Riggs

Discussion with: Josh Berkus, Jaime Casanova, Peter Eisentraut,
David Fetter, Yeb Havinga, Alvaro Herrera, Petr Jelinek, Tom Lane,
MauMau, Bruce Momjian, Jim Nasby, Michael Paquier,
Fabrízio de Royes Mello, Neil Tiffin

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/ac52bb0442f79076b14acd8ad5b696946c1053b8

Modified Files
--------------
contrib/Makefile                       |    1 +
contrib/pg_audit/.gitignore            |    5 +
contrib/pg_audit/Makefile              |   21 +
contrib/pg_audit/expected/pg_audit.out |  964 ++++++++++++++++
contrib/pg_audit/pg_audit--1.0.0.sql   |   22 +
contrib/pg_audit/pg_audit.c            | 1870 ++++++++++++++++++++++++++++++++
contrib/pg_audit/pg_audit.conf         |    1 +
contrib/pg_audit/pg_audit.control      |    5 +
contrib/pg_audit/sql/pg_audit.sql      |  617 +++++++++++
doc/src/sgml/contrib.sgml              |    1 +
doc/src/sgml/filelist.sgml             |    1 +
doc/src/sgml/pgaudit.sgml              |  678 ++++++++++++
12 files changed, 4186 insertions(+)