8174915: Improve error handing for Jdp tests under sun/management/jdp

Summary: Added checks for abnormal exits of spawn process by test cases
Reviewed-by: dholmes, dfuchs, sspitsyn
Contributed-by: amit.sapre@oracle.com

jdk/test/sun/management/jdp/DynamicLauncher.java

@@ -58,6 +58,11 @@ public abstract class DynamicLauncher {
                 }
             }
         } while (tryAgain);
+        output.shouldHaveExitValue(0);
+        // java.lang.Exception is thrown by JdpTestCase if something goes wrong
+        // for instance - see JdpTestCase::shutdown()
+        output.shouldNotContain("java.lang.Exception:");
+        output.shouldNotContain("Error: Could not find or load main class");
     }
 
     protected OutputAnalyzer runVM() throws Exception {

jdk/test/sun/management/jdp/JdpJmxRemoteDynamicPortTest.java

@@ -40,7 +40,6 @@ public class JdpJmxRemoteDynamicPortTest  extends DynamicLauncher {
     public static void main(String[] args) throws Exception {
         DynamicLauncher launcher = new JdpJmxRemoteDynamicPortTest();
         launcher.run();
-        launcher.getProcessOutpoutAnalyzer().stderrShouldNotContain("java.lang.Exception:");
     }
 
     protected String[] options() {