Add "manager" scope into privet API BUG=25049439 Change-Id: Ide930d204ebf243c0aa9df3820959f5dfdb0e1d1 Reviewed-on: https://weave-review.googlesource.com/1966 Reviewed-by: Vitaly Buka <vitalybuka@google.com> Reviewed-by: Alex Vakulenko <avakulenko@google.com>