Apply suggestions from code review

Co-authored-by: dahn <daan.hoogland@gmail.com>

Author: GutoVeronezi

api/src/main/java/org/apache/cloudstack/api/command/admin/vpc/CreateVPCOfferingCmd.java

@@ -224,7 +224,7 @@ public Map<String, List<String>> getServiceProviders() {
             Iterator<? extends Map<String, String>> iter = servicesCollection.iterator();
             while (iter.hasNext()) {
                 Map<String, String> obj = iter.next();
-                logger.trace("Service provider entry specified: ", obj);
+                logger.trace("Service provider entry specified: {}", obj);
                 HashMap<String, String> services = (HashMap<String, String>)obj;
                 String service = services.get("service");
                 String provider = services.get("provider");