Fix for couchbase-cli commit validation script failure

Change-Id: Ie869293d226d24e97cf329f3466d506139191fac
Reviewed-on: http://review.couchbase.org/38457
Reviewed-by: Bin Cui <bin.cui@gmail.com>
Reviewed-by: Eric Limare <eric.limare@couchbase.com>
Tested-by: Eric Limare <eric.limare@couchbase.com>