Sort snowflake-ips stats by country count.

We currently don't sort the snowflake-ips metrics:

    snowflake-ips CA=1,DE=1,AR=1,NL=1,FR=1,GB=2,US=4,CH=1

To facilitate eyeballing our metrics, this patch sorts snowflake-ips by
value.  If the value is identical, we sort by string, i.e.:

    snowflake-ips US=4,GB=2,AR=1,CA=1,CH=1,DE=1,FR=1,NL=1

This patch fixes #40011
4 jobs for master in 25 minutes and 45 seconds (queued for 30 seconds)
Status Job ID Name Coverage
  Test
passed #6600
android

00:13:02

passed #6603
debian-testing

00:12:00

passed #6601
go-1.13

00:05:07

passed #6602
go-1.14

00:05:35