Resolves code smells of OpenstackNetworkingUtil, RulePopulatorUtil and cli classes.

Change-Id: Id313b66f1b5303cea17477f3763496b405f08b87
diff --git a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/cli/DeleteExternalPeerRouterCommand.java b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/cli/DeleteExternalPeerRouterCommand.java
index 77bec0e..1188325 100644
--- a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/cli/DeleteExternalPeerRouterCommand.java
+++ b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/cli/DeleteExternalPeerRouterCommand.java
@@ -54,7 +54,7 @@
         try {
             service.deleteExternalPeerRouter(ipAddress);
         } catch (IllegalArgumentException e) {
-            log.error("Exception occurred because of {}", e.toString());
+            log.error("Exception occurred because of {}", e);
         }
         print(FORMAT, "Router IP", "Mac Address", "VLAN ID");
         List<ExternalPeerRouter> routers = Lists.newArrayList(service.externalPeerRouters());