Update test suite to take redfish login and logout

Changes:
    - Added PLDM platform code to get redfish logout and logout.
    - Added Suite Setup and teardown for sanity ras test suite.

Change-Id: Idbb40b8ff78e30a5bea3cf03749e8541870b99d7
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/pldm/test_pldm_platform.robot b/pldm/test_pldm_platform.robot
index d2f1662..f6c52ad 100644
--- a/pldm/test_pldm_platform.robot
+++ b/pldm/test_pldm_platform.robot
@@ -117,5 +117,7 @@
 Pldmtool Platform Suite Cleanup
     [Documentation]    Reset BMC at suite cleanup.
 
+    Redfish.Login
     Redfish Hard Power Off
     Redfish Power On
+    Redfish.Logout