pgsql: Clean up some stray remaining references to pg_shadow, pg_user,

Log Message:
-----------
Clean up some stray remaining references to pg_shadow, pg_user, pg_group.

Modified Files:
--------------
pgsql/doc/src/sgml/ref:
dropuser.sgml (r1.32 -> r1.33)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/dropuser.sgml.diff?r1=1.32&r2=1.33)
reindex.sgml (r1.27 -> r1.28)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/reindex.sgml.diff?r1=1.27&r2=1.28)
pgsql/doc/src/sgml:
xaggr.sgml (r1.28 -> r1.29)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/xaggr.sgml.diff?r1=1.28&r2=1.29)
pgsql/src/backend/libpq:
crypt.c (r1.64 -> r1.65)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/libpq/crypt.c.diff?r1=1.64&r2=1.65)
pg_hba.conf.sample (r1.58 -> r1.59)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/libpq/pg_hba.conf.sample.diff?r1=1.58&r2=1.59)
pgsql/src/backend/utils/misc:
superuser.c (r1.32 -> r1.33)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/misc/superuser.c.diff?r1=1.32&r2=1.33)
pgsql/src/bin/scripts:
dropuser.c (r1.14 -> r1.15)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/scripts/dropuser.c.diff?r1=1.14&r2=1.15)
pgsql/src/test/regress/expected:
privileges.out (r1.31 -> r1.32)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/privileges.out.diff?r1=1.31&r2=1.32)
pgsql/src/test/regress/sql:
privileges.sql (r1.16 -> r1.17)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/privileges.sql.diff?r1=1.16&r2=1.17)
pgsql/src/tutorial:
syscat.source (r1.14 -> r1.15)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tutorial/syscat.source.diff?r1=1.14&r2=1.15)