Fixing iteration for role content

Change-Id: I9a72bd0eba2e08441fadfcca9180be07a17653ad
Signed-off-by: Eduardo Sousa <eduardo.sousa@canonical.com>
diff --git a/osm_nbi/admin_topics.py b/osm_nbi/admin_topics.py
index d6112e1..a737301 100644
--- a/osm_nbi/admin_topics.py
+++ b/osm_nbi/admin_topics.py
@@ -865,10 +865,11 @@
         content[":"] = False
 
         ignore_fields = ["_id", "_admin", "name"]
-        for role_def, value in content.items():
+        content_keys = content.keys()
+        for role_def in content_keys:
             if role_def in ignore_fields:
                 continue
-            content[role_def.replace(".", ":")] = value
+            content[role_def.replace(".", ":")] = content[role_def]
             del content[role_def]
 
     @staticmethod