MB-23271: Sort the stats on keys for diag output
MB-23271: Sort the stats on keys for diag output

+ For better readability

Change-Id: Iae23b5f8588aebf4833768451e616d9487d3f74a
Reviewed-on: http://review.couchbase.org/75003
Reviewed-by: Sundararaman Sridharan <333a3f71d3ad6e01fc953c4fa06bc1f3cd014910@couchbase.com>
Reviewed-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>
Tested-by: abhinav dangeti <d73ef2279de6577f7bf081737ee47554bbb7dc82@couchbase.com>

couchbaselabs/moss,steveyen/moss,steveyen/moss