Revert "kvm does not crash nbd is dead"

This reverts commit a0e1023b.

slapos/recipe/kvm/template/kvm_run.in

@@ -8,7 +8,7 @@ fi
 
 # TODO: -net nic,model=virtio, but OS installer has to provide the virtio_net
 # module
-%(qemu_path)s \
+exec %(qemu_path)s \
   -net nic,macaddr=%(mac_address)s \
   -smp %(smp_count)s \
   -m %(ram_size)s \
@@ -20,18 +20,3 @@ fi
   -pidfile %(pid_file_path)s \
   -no-kvm
  # -net tap,ifname=%(tap_interface)s,script=no,downscript=no \
-
-if [ $? -eq 1 ]
-then
-%(qemu_path)s \
-  -net nic,macaddr=%(mac_address)s \
-  -net tap,ifname=%(tap_interface)s,script=no,downscript=no \
-  -smp %(smp_count)s \
-  -m %(ram_size)s \
-  -drive file=%(disk_path)s,if=virtio,boot=on \
-  -vnc %(vnc_ip)s:1,ipv4,password \
-  -boot menu=on \
-  -qmp unix:%(socket_path)s,server \
-  -pidfile %(pid_file_path)s
-  -no-kvm
-fi