This CL removes the "READ vs UPDATE" feature completely. Now anyone with access
has full read+write access.
We still keep track of which role a user has (did they get access "explicitly"
because they are an "allowed access" contact? Or do they have access because
they are admins?) for the logs and UI, and also so we could in the (very near)
future have features only available to admins.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=218169608
SessionUtil is renames AuthenticatedRegistrarAccessor, as it's used to access a registrar for an authenticated user.
It will now be injected with the AuthResult instead of receiving it in every function call, since there's only one "legal" AuthResult to use.
The AccessType names are changed from READ_ONLY/READ_WRITE to READ/UPDATE, as it was confusing that a user could have both READ_ONLY AND READ_WRITE access to the same registrar.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=216958306
