Update S3 image store discovery to include endpoint and bucket name in URL

Author: Damans227

api/src/main/java/org/apache/cloudstack/api/command/admin/storage/AddImageStoreS3CMD.java

@@ -131,8 +131,9 @@ public void execute() throws ResourceUnavailableException, InsufficientCapacityE
             dm.put(ApiConstants.S3_USE_TCP_KEEPALIVE, getUseTCPKeepAlive().toString());
         }
 
+        String url = getEndPoint() + "/" + getBucketName();
         try{
-            ImageStore result = _storageService.discoverImageStore(null, null, "S3", zoneId, dm);
+            ImageStore result = _storageService.discoverImageStore(null, url, "S3", zoneId, dm);
             ImageStoreResponse storeResponse;
             if (result != null) {
                 storeResponse = _responseGenerator.createImageStoreResponse(result);