Add a command to allow us to create the managed zone for a new TLD in cloud
dns.
Note: this implementation is problematic, it's currently doing its own thing
as far as credentials and http transport, making it unusable with the []
channel and the credentials generated by login. Unfortunately, fixing the
plumbing to make it work right is difficult, and we have an immediate need for
this functionality.
b/67367533 created to clean this up, along with related warts in the codebase.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=170906329
