Update packaging metadata for 2.4.0-beta

- Note that the debian changelog has its '*' bullets removed. This is
  intentional as Debian inserts its own bullets (per dpkg-parsechanges).
- References to the cbcrc(4) manpage has been restored.

Change-Id: I77cbbaa601cb8755c4657692535e9c111810cf80
Reviewed-on: http://review.couchbase.org/39336
Reviewed-by: Matt Ingenthron <matt@couchbase.com>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>