Update redfish host graceful restart boot type

Changes:
      - Modify "Redfish Host Reboot" to "RF SYS GracefulRestart".
      - Update lib and test cases with new boot type name.

Change-Id: I8fe9c9569bb20810604a792263eb9f76eec66d16
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/lib/utils.robot b/lib/utils.robot
index 152b9b7..f05ff31 100755
--- a/lib/utils.robot
+++ b/lib/utils.robot
@@ -726,7 +726,7 @@
     #        Immediate: Wait For Reboot  start_boot_seconds=${state['epoch_seconds']}
     #    },
     #    Host image: {
-    #        OnReset: Redfish Host Reboot,
+    #        OnReset: RF SYS GracefulRestart,
     #        Immediate: Wait State  os_running_match_state  10 mins
     #    }
     # }