selftests: futex Makefile add top level TAP header echo to RUN_TESTS

Add top level TAP header echo, testname and separator line to make
the output consistent with the common run_tests target.

This change prevents nested TAP13 headers output from individual tests.
Nested TAP13 headers could cause problems for some parsers.
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
Reviewed-by: Darren Hart (VMware) <dvhart@infradead.org>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>

tools/testing/selftests/futex/Makefile

@@ -18,6 +18,10 @@ all:
 	done
 
 override define RUN_TESTS
+	@export KSFT_TAP_LEVEL=`echo 1`;
+	@echo "TAP version 13";
+	@echo "selftests: futex";
+	@echo "========================================";
 	@cd $(OUTPUT); ./run.sh
 endef