Update SMB password before mounting store to VM

Update the password using the create_user function. Don't modify other attributes of the user.

circle/vm/operations.py

@@ -1760,8 +1760,11 @@ class MountStoreOperation(EnsureAgentMixin, InstanceOperation):
         inst = self.instance
         queue = self.instance.get_remote_queue_name("agent")
         host = urlsplit(settings.STORE_URL).hostname
-        username = Store(user).username
+        store = Store(user)
+        username = store.username
         password = user.profile.smb_password
+        # make sure correct smb password is set
+        store.create_user(password, None, None)
         agent_tasks.mount_store.apply_async(
             queue=queue, args=(inst.vm_name, host, username, password))