fix default legend values
fix default legend values

Change-Id: Ibdacae243e34483b2ec77c09bfda4ce9a932235a
Reviewed-on: http://review.couchbase.org/33095
Reviewed-by: Pavel Paulau <dd88eded64e90046a680e3a6c0828ceb8fe8a0e7@gmail.com>
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>

couchbase/cbmonitor,couchbase/cbmonitor