Addressed some checkstyle, PMD and findbugs violations in the ARP module

Change-Id: I194533ba5f96a7631ea662a93cbcbd8a2c84dea9
diff --git a/src/main/java/net/onrc/onos/ofcontroller/proxyarp/ArpWebRoutable.java b/src/main/java/net/onrc/onos/ofcontroller/proxyarp/ArpWebRoutable.java
index eefa2db..606fb29 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/proxyarp/ArpWebRoutable.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/proxyarp/ArpWebRoutable.java
@@ -6,17 +6,31 @@
 import org.restlet.Restlet;
 import org.restlet.routing.Router;
 
+/**
+ * Routing class for ARP module REST URLs.
+ */
 public class ArpWebRoutable implements RestletRoutable {
 
-	@Override
-	public Restlet getRestlet(Context context) {
-		Router router = new Router(context);
-		router.attach("/cache/json", ArpCacheResource.class);
-		return router;
-	}
+    /**
+     * Get a router configured with ARP module REST URLs.
+     *
+     * @param context the restlet context to build a router with
+     * @return the router
+     */
+    @Override
+    public Restlet getRestlet(Context context) {
+        Router router = new Router(context);
+        router.attach("/cache/json", ArpCacheResource.class);
+        return router;
+    }
 
-	@Override
-	public String basePath() {
-		return "/wm/arp";
-	}
+    /**
+     * Get the base path of the ARP module URLs.
+     *
+     * @return the string base path
+     */
+    @Override
+    public String basePath() {
+        return "/wm/arp";
+    }
 }