rcutorture: Make kvm-recheck.sh export TORTURE_SUITE

As it should, the kvm-recheck.sh script sets the TORTURE_SUITE bash
variable based on the type of rcutorture test being run.  However,
it does not export it.  Which is OK, at least until you try running
kvm-again.sh on either a rcuscale or a refscale test, at which point you
get false-positive "no success message, N successful version messages"
errors.  This commit therefore causes the kvm-recheck.sh script to export
TORTURE_SUITE, suppressing these false positives.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

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

@@ -30,7 +30,7 @@ do
 			resdir=`echo $i | sed -e 's,/$,,' -e 's,/[^/]*$,,'`
 			head -1 $resdir/log
 		fi
-		TORTURE_SUITE="`cat $i/../torture_suite`"
+		TORTURE_SUITE="`cat $i/../torture_suite`" ; export TORTURE_SUITE
 		configfile=`echo $i | sed -e 's,^.*/,,'`
 		rm -f $i/console.log.*.diags
 		case "${TORTURE_SUITE}" in