This improves one of our gTech processes so they no longer have to remember to create Google Groups for a registrar after creating that registrar.
The ConfirmingCommand.verify() method is renamed to be more general purpose, so that it can do anything that follows naturally after a successful execution, such as creating Google Groups groups.
Minor refactoring is done around RegistryToolEnvironment handling for tests to make it more bullet-proof and general case.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=117494277