This is the second of many cls adding explicit logging in all our domain
mutation flows to facilitate transaction reporting.
Adds and renews each result in a +1 counter for the NET_ADDS/RENEWS_#_YR field,
which I've added simple (# of years, add or renew) -> Enum functions to get.
Allocates are just a special case of adds, and are counted in a similar manner.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=165963249
c40dc67c5b