fix card2host and host2card stopping commands
fix card2host and host2card stopping commands

To correctly stop those programs, one has to send SIGINT, SIGTSTP and
then SIGCONT.

Thanks @jfzazo for the tip.

EduardoMiravalls/NetWatcher,EduardoMiravalls/NetWatcher,EduardoMiravalls/NetWatcher