tests: uml: Request non-raw serial ports

When the serial ports are set into raw mode on stdio (fd:0,fd:1)
then Ctrl-C is sort of passed through, but not effective. Request
non-raw mode to avoid that and let us cancel test execution with
Ctrl-C properly (both in parallel-vm.py and vm-run.sh cases).

Note that this requires a currently out-of-tree patch, but so
does the virtual time. If the patch is not applied, the command
line argument is ignored.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

tests/hwsim/vm/vm-run.sh

@@ -172,6 +172,7 @@ if [ -z $KVM ]; then
 	     root=none hostfs=/ rootfstype=hostfs rootflags=/ \
 	     ssl0=fd:0,fd:1 \
 	     ssl1=fd:100 \
+	     ssl-non-raw \
 	     100<>$LOGDIR/console 2>&1 | \
 	    sed -u '0,/VM has started up/d'
 else