MB-33402: Cbstats -j does not print values
MB-33402: Cbstats -j does not print values

This error was introduced with natsort. "natsorted(stats)"
returns a sorted dictionary of only keys, so all values are
lost when we print in json format. Fix this by copying every
stat into a new dictionary in the ordering given by natsort,
then performing our other conversions on them.

Change-Id: I7098ed50c63cf3ac86e1dad4214cfc9fa977eccb
Reviewed-on: http://review.couchbase.org/106441
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Daniel Owen <b3fc0e1a51f252986e60be7da121b74d3ac6845f@couchbase.com>

daverigby/kv_engine,daverigby/kv_engine,daverigby/kv_engine,daverigby/kv_engine