Make 'couchbase_version' script print version after generation

Change-Id: Iaf59bfb9f617bf330713fe7df19b4772073f98a3
Reviewed-on: http://review.couchbase.org/29288
Reviewed-by: Mark Nunberg <mnunberg@haskalah.org>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>