Update metadata for release 2.4.1

Change-Id: I75ca77e95ccb697bc599576ef62f6434ff266c05
Reviewed-on: http://review.couchbase.org/40883
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Reviewed-by: Brett Lawson <brett19@gmail.com>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>