Update only the repo that was added instead of all repos

Change-Id: I70c75ced584b40873566a36f2dfc900abc824767
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/n2vc/k8s_helm_base_conn.py b/n2vc/k8s_helm_base_conn.py
index 8c52a7b..37df6c1 100644
--- a/n2vc/k8s_helm_base_conn.py
+++ b/n2vc/k8s_helm_base_conn.py
@@ -178,8 +178,8 @@
         )
 
         # helm repo update
-        command = "env KUBECONFIG={} {} repo update".format(
-            paths["kube_config"], self._helm_command
+        command = "env KUBECONFIG={} {} repo update {}".format(
+            paths["kube_config"], self._helm_command, name
         )
         self.log.debug("updating repo: {}".format(command))
         await self._local_async_exec(