8217748: [TESTBUG] Exclude TestSig test case from JFR TestShutdownEvent

Summary: Excluded TestSig cases from the test
Reviewed-by: egahlin

test/jdk/jfr/event/runtime/TestShutdownEvent.java

@@ -57,9 +57,11 @@ public class TestShutdownEvent {
              new TestVMCrash(),
              new TestUnhandledException(),
              new TestRuntimeHalt(),
-             new TestSig("TERM"),
-             new TestSig("HUP"),
-             new TestSig("INT")};
+             // exclude until JDK-8217744 is fixed
+             // new TestSig("TERM"),
+             // new TestSig("HUP"),
+             // new TestSig("INT")
+    };
 
     public static void main(String[] args) throws Throwable {
         for (int i = 0; i < subTests.length; ++i) {