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/boot_utils.robot b/lib/boot_utils.robot
index 61bc876..ee50d4b 100644
--- a/lib/boot_utils.robot
+++ b/lib/boot_utils.robot
@@ -824,8 +824,8 @@
     Run Key U  ${cmd_buf}
 
 
-Redfish Host Reboot
-    [Documentation]  Do "Redfish Host Reboot" boot test.
+RF SYS GracefulRestart
+    [Documentation]  Do "RF SYS GracefulRestart" boot test.
     [Arguments]  ${stack_mode}=${stack_mode}  ${quiet}=${quiet}
 
     # Description of argument(s):
@@ -845,7 +845,7 @@
     #                               information.  The default value is the
     #                               global value of "${quiet}"
 
-    ${cmd_buf}  Catenate  OBMC Boot Test \ loc_boot_stack=Redfish Host Reboot
+    ${cmd_buf}  Catenate  OBMC Boot Test \ loc_boot_stack=RF SYS GracefulRestart
     ...  \ loc_stack_mode=${stack_mode} \ loc_quiet=${quiet}
     Run Key U  ${cmd_buf}