mgmt: qvm.start() should not start guid unconditionally

[marmarek]

Currently it does. Which of course fails when called from firstboot.
https://github.com/QubesOS/qubes-mgmt-salt-dom0-qvm/blob/master/_modules/ext_module_qvm.py#L1330-L1347

    def is_transient():
        '''
        Start guid if VM is `transient`.
        '''
        transient_status = state(args.vmname, *['transient'])
        if transient_status.passed():
            if __opts__['test']:
                message = '\'guid\' will be started since in \'transient\' state!'
                qvm.save_status(transient_status, message=message)
                return qvm.status()

            # 'start_guid' then confirm 'running' power state
            start_guid()
            return not is_running(
                qvm,
                error_message='\'guid\' failed to start!'
            )
        return False

[marmarek]

Done.

[marmarek]

Done.