MB-13458: Initialize default snapshot field
MB-13458: Initialize default snapshot field

Change-Id: I0272b5e74ddd4592e93e2d74823966e8aab64f12
Reviewed-on: http://review.couchbase.org/46979
Reviewed-by: Bin Cui <ed18693fff32c00e22495f4877a3b901bed09041@gmail.com>
Tested-by: Bin Cui <ed18693fff32c00e22495f4877a3b901bed09041@gmail.com>

couchbase/couchbase-cli,couchbase/couchbase-cli