Feature 10908 pass over upgrade request to Libjuju

Change-Id: I7a4ea434f22b939a80f58941a892ed92dae62ee6
Signed-off-by: aticig <gulsum.atici@canonical.com>
diff --git a/n2vc/k8s_helm_base_conn.py b/n2vc/k8s_helm_base_conn.py
index efca96f..952630a 100644
--- a/n2vc/k8s_helm_base_conn.py
+++ b/n2vc/k8s_helm_base_conn.py
@@ -938,6 +938,28 @@
         self.log.debug("Instance {} not found".format(kdu_instance))
         return None
 
+    async def upgrade_charm(
+        self,
+        ee_id: str = None,
+        path: str = None,
+        charm_id: str = None,
+        charm_type: str = None,
+        timeout: float = None,
+    ) -> str:
+        """This method upgrade charms in VNFs
+
+        Args:
+            ee_id:  Execution environment id
+            path:   Local path to the charm
+            charm_id:   charm-id
+            charm_type: Charm type can be lxc-proxy-charm, native-charm or k8s-proxy-charm
+            timeout: (Float)    Timeout for the ns update operation
+
+        Returns:
+            The output of the update operation if status equals to "completed"
+        """
+        raise K8sException("KDUs deployed with Helm do not support charm upgrade")
+
     async def exec_primitive(
         self,
         cluster_uuid: str = None,