REDFISH: Script fix needed for in jobs_processing.py

Changes:
   -  Updated the return value in execute_process_multi_keyword
      python function under lib/jobs_processing.py

Tested:
   - Ran redfish/managers/test_multiple_interfaces.robot

Change-Id: I81a7e8bb0b7308c888641233d3965068b61d9d80
Signed-off-by: KothaiSrini<kothais@ami.com>
diff --git a/lib/jobs_processing.py b/lib/jobs_processing.py
index 2c214df..50e69ad 100644
--- a/lib/jobs_processing.py
+++ b/lib/jobs_processing.py
@@ -109,7 +109,7 @@
     # Wait for process to complete.
     for task in process_list:
         task.join()
-    return return_dict
+    return return_dict.copy()
 
 
 def get_current_date_time():