[9.1 beta 1] log_timezone = "unknown" does not work any more

Hello all,

I (or rather the Debian postgresql-common) test suite noticed that
postgresql.conf's "log_timezone =3D unknown" does not work any more:

  server starting
  FATAL:  invalid value for parameter "log_timezone": "unknown"

I think this should be considered a regression, as it's still in
postgresql.conf.sample, and in the documentation [1].

Thanks,

Martin

[1] http://developer.postgresql.org/pgdocs/postgres/runtime-config-logging.=
html#GUC-LOG-TIMEZONE
--=20
Martin Pitt                        | http://www.piware.de
Ubuntu Developer (www.ubuntu.com)  | Debian Developer  (www.debian.org)