[PATCH v5] testpmd: cleanup cleanly from signal

[Stephen Hemminger]

> > +		stop_packet_forwarding();  
> 
> force_quit() calls stop_packet_forwarding() if test_done is 0.
> So, there is no difference in test_done == 0 case.
> If test_done is not zero, stop_packet_forwarding() just logs
> "Packet forwarding not started" and does nothing. So, the
> difference is only in error message. Is it intentional?
> 
> > +		force_quit();
> >   	}

Will fix in new version, it was a logic error.