Fix issues found by FindBugs: EQ_DOESNT_OVERRIDE_EQUALS

http://findbugs.sourceforge.net/bugDescriptions.html#EQ_DOESNT_OVERRIDE_EQUALS

Added @Override implementations of equals() and hashCode() in the derived classes.

TODO: The implementations in the derived classes redirect to the implementations
in the base class. This needs to be revised and fixed/updated as appropriate.

Change-Id: Ib586ebea685c57af281eaea6630e284240e2376a
diff --git a/src/main/java/net/onrc/onos/core/intent/ErrorIntent.java b/src/main/java/net/onrc/onos/core/intent/ErrorIntent.java
index 44ef6c3..c1722fd 100644
--- a/src/main/java/net/onrc/onos/core/intent/ErrorIntent.java
+++ b/src/main/java/net/onrc/onos/core/intent/ErrorIntent.java
@@ -28,4 +28,16 @@
         this.message = message;
         this.parentIntent = parentIntent;
     }
+
+    @Override
+    public int hashCode() {
+        // TODO: Is this the intended behavior?
+        return (super.hashCode());
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        // TODO: Is this the intended behavior?
+        return (super.equals(obj));
+    }
 }