torture: Permit multi-word qemu and boot arguments

This commit applies quotes to permit multi-word --qemu-args and
--bootargs arguments.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

tools/testing/selftests/rcutorture/bin/kvm.sh

@@ -276,8 +276,8 @@ awk < $T/cfgcpu.pack \
 	-v ncpus=$cpus \
 	-v rd=$resdir/$ds/ \
 	-v dur=$dur \
-	-v TORTURE_QEMU_ARG=$TORTURE_QEMU_ARG \
-	-v TORTURE_BOOTARGS=$TORTURE_BOOTARGS \
+	-v TORTURE_QEMU_ARG="$TORTURE_QEMU_ARG" \
+	-v TORTURE_BOOTARGS="$TORTURE_BOOTARGS" \
 'BEGIN {
 	i = 0;
 }