NBI changes for Grafana Multitenancy feature

Change-Id: If92574606108152fed505dd5c132176721aa1736
Signed-off-by: agarwalat <atul.agarwal@altran.com>
diff --git a/osm_nbi/base_topic.py b/osm_nbi/base_topic.py
index c67ec76..bbe6337 100644
--- a/osm_nbi/base_topic.py
+++ b/osm_nbi/base_topic.py
@@ -308,6 +308,7 @@
 
     def _send_msg(self, action, content, not_send_msg=None):
         if self.topic_msg and not_send_msg is not False:
+            content = content.copy()
             content.pop("_admin", None)
             if isinstance(not_send_msg, list):
                 not_send_msg.append((self.topic_msg, action, content))