make n1ql update key range larger to avoid cas mismatch errors
make n1ql update key range larger to avoid cas mismatch errors

Change-Id: I064f1e6a693036abd5d816b491b8f36fb3f38b00
Reviewed-on: http://review.couchbase.org/c/perfrunner/+/135260
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Bo-Chun Wang <bb86fd206c9c35341feb9b50e74a74a83e254d63@couchbase.com>

couchbase/perfrunner,couchbase/perfrunner,couchbase/perfrunner,couchbase/perfrunner,couchbase/perfrunner,couchbase/perfrunner