docs: def is_registered(self, cuuid, host):
          """This function will check to see if a given host with client uuid is
          currently registered.
  
          Args:
            cuuid (string): The client uuid that wishes to register.
            host (tuple): The (address, port) tuple of the client that is
              registering.
  
          Returns:
            Will return True if the client is registered and will return False if
            it is not.
  
          """
          # Check to see if the host with the client uuid exists in the registry
          # table.
          if (cuuid in self.registry) and (self.registry[cuuid]["host"] == host):
              return True
          else:
              return False