Log Message:
-----------
Add vacuum_defer_cleanup_age to postgresql.conf.sample.
Modified Files:
--------------
pgsql/src/backend/utils/misc:
postgresql.conf.sample (r1.278 -> r1.279)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/misc/postgresql.conf.sample?r1=1.278&r2=1.279)