TestNG has got "Skip", individual tests might throw SkipException.
Example:
/*
 * @test
 * @run testng Skip
 */
import org.testng.annotations.Test;
import org.testng.SkipException;
public class Skip {
    @Test
    public void test1() {
        throw new SkipException("not applicable");
    }

    @Test
    public void test2() {
    }
}

TestNG status of execution such test will be:
===============================================
Skip.java
Total tests run: 2, Failures: 0, Skips: 1
===============================================

But if this test is run by jtreg the status will be:
STATUS:Failed.`main' threw exception: java.lang.Exception: failures: 1


jtreg should be updated to not treat skipped tests as failures.