Fix bug 1591 - TypeError fix

Fixes the formatting error reported by bug 1591.

Change-Id: I00446760ce4ab781ef6ca783e3a5f3221c94a774
Signed-off-by: sousaedu <eduardo.sousa@canonical.com>
diff --git a/osm_nbi/auth.py b/osm_nbi/auth.py
index 6c9ee92..eef2ae7 100644
--- a/osm_nbi/auth.py
+++ b/osm_nbi/auth.py
@@ -502,7 +502,7 @@
                     query_string_operations,
                     item_id,
                 )
-                self.logger.info("RBAC_auth: {}", format(RBAC_auth))
+                self.logger.info("RBAC_auth: {}".format(RBAC_auth))
                 token_info["allow_show_user_project_role"] = RBAC_auth
 
             return token_info