Specify ctor options (i.e. k=v&k=v) as volatile

Change-Id: I49b9f542ec4634b09f5bf644c8de3b0f450c7ba3
Reviewed-on: http://review.couchbase.org/39972
Reviewed-by: Brett Lawson <brett19@gmail.com>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>