Handle ZERO's new carrier ip subnets

(tested on betalabs)

The code splits X-CS "123-45|abc" ID into two values for X-Analytics
"zero=123-45;zeronet=abc". It also handles the temporary workaround
we had for 404-01b, treating it as "404-01|b".

Change-Id: Id79a4383050665273952623c0fe947300eccdfbb