def prepare
        self.tube_names.map! { |name| expand_tube_name(name)  }.uniq!
        log_info "Working #{tube_names.size} queues: [ #{tube_names.join(', ')} ]"
        self.connection.tubes.watch!(*self.tube_names)
      end
Used to prepare job queues before processing jobs.
Setup beanstalk tube_names and watch all specified tubes for jobs.

@raise [Beaneater::NotConnected] If beanstalk fails to connect.
@example
@worker.prepare