Avoid super constructor that fills in the stacktrace.

hikaricp-java6/src/main/java/com/zaxxer/hikari/util/LeakTask.java

@@ -79,6 +79,7 @@ public class LeakTask implements Runnable
        */
       public LeakException(final StackTraceElement[] stackTrace)
       {
+         super("Connection Leak", null, true, true);
          this.setStackTrace(stackTrace);
       }
    }

hikaricp/src/main/java/com/zaxxer/hikari/util/LeakTask.java

@@ -79,6 +79,7 @@ public class LeakTask implements Runnable
        */
       public LeakException(final StackTraceElement[] stackTrace)
       {
+         super("Connection Leak", null, true, true);
          this.setStackTrace(stackTrace);
       }
    }