* testsuite/README: Change "UNSUPPORTED" tag to "FEATURE".

* testsuite/runtest (run_applet_testcase): Likewise.
* testsuite/cp/cp-preserves-hard-links: Likewise.
* testsuite/grep/egrep-supports-extended-regexps: Likewise.
* testsuite/grep/grep-is-also-egrep: Likewise.
* testsuite/tar/tar-archives-multiple-files: Likewise.
* testsuite/tar/tar-handles-empty-include-and-non-empty-exclude-list:
  Likewise.
* testsuite/tar/tar-handles-exclude-and-extract-lists: Likewise.
* testsuite/tar/tar-handles-nested-exclude: Likewise.

testsuite/runtest

@@ -36,8 +36,8 @@ run_applet_testcase ()
 		return 0
 	fi
 
-	if grep -q "^# UNSUPPORTED: " $testcase; then
-		local feature=`sed -ne 's/.*UNSUPPORTED: //p' $testcase`
+	if grep -q "^# FEATURE: " $testcase; then
+		local feature=`sed -ne 's/^# FEATURE: //p' $testcase`
 
 		if grep -q "^# ${feature} is not set$" ../.config; then
 			show_result UNTESTED $testname