Starts uBridge (handles connections to and from this node).

def _start_ubridge(self):
        """
        Starts uBridge (handles connections to and from this node).
        """

        # Prevent us to start multiple ubridge
        if self._ubridge_hypervisor and self._ubridge_hypervisor.is_running():
            return

        if self.ubridge_path is None:
            raise NodeError("uBridge is not available, path doesn't exist, or you just installed GNS3 and need to restart your user session to refresh user permissions.")

        if not self._manager.has_privileged_access(self.ubridge_path):
            raise NodeError("uBridge requires root access or the capability to interact with network adapters")

        server_config = self._manager.config.get_section_config("Server")
        server_host = server_config.get("host")
        if not self.ubridge:
            self._ubridge_hypervisor = Hypervisor(self._project, self.ubridge_path, self.working_dir, server_host)
        log.info("Starting new uBridge hypervisor {}:{}".format(self._ubridge_hypervisor.host, self._ubridge_hypervisor.port))
        yield from self._ubridge_hypervisor.start()
        if self._ubridge_hypervisor:
            log.info("Hypervisor {}:{} has successfully started".format(self._ubridge_hypervisor.host, self._ubridge_hypervisor.port))
            yield from self._ubridge_hypervisor.connect()