Redfish python utility

Changes:
    - New redfish utility library code.
    - Move generic utility functions to new library.
    - Update test cases with new utility object acces.

Change-Id: Ia2bb18cb46ca93503853bbfd1773d3e4447339c9
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/redfish/service_root/test_service_root.robot b/redfish/service_root/test_service_root.robot
index e60793e..23a2ea6 100644
--- a/redfish/service_root/test_service_root.robot
+++ b/redfish/service_root/test_service_root.robot
@@ -69,10 +69,10 @@
     # Example o/p:
     # [{'@odata.id': '/redfish/v1/SessionService/Sessions/bOol3WlCI8'},
     #  {'@odata.id': '/redfish/v1/SessionService/Sessions/Yu3xFqjZr1'}]
-    ${resp_list}=  redfish.List Request  /redfish/v1/SessionService/Sessions
+    ${resp_list}=  redfish_utils.List Request  /redfish/v1/SessionService/Sessions
     redfish.Delete  ${resp_list[1]}
 
-    ${resp}=  redfish.List Request  /redfish/v1/SessionService/Sessions
+    ${resp}=  redfish_utils.List Request  /redfish/v1/SessionService/Sessions
     List Should Not Contain Value  ${resp}  ${resp_list[1]}