CCBC-441: Set expiration from old-style to new style command

Change-Id: I4a14643d3835475bc1b67e20c47e2a14d6edda40
Reviewed-on: http://review.couchbase.org/37785
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Brett Lawson <brett19@gmail.com>
Tested-by: Brett Lawson <brett19@gmail.com>