8250627: Use -XX:+/-UseContainerSupport for enabling/disabling Java container metrics

Reviewed-by: aph, dholmes, bobv

src/java.base/linux/classes/jdk/internal/platform/CgroupMetrics.java

@@ -160,7 +160,13 @@ public class CgroupMetrics implements Metrics {
     }
 
     public static Metrics getInstance() {
+        if (!isUseContainerSupport()) {
+            // Return null on -XX:-UseContainerSupport
+            return null;
+        }
         return CgroupSubsystemFactory.create();
     }
 
-}
+    private static native boolean isUseContainerSupport();
+
+}