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/redfish/extended/test_os_reboot.robot b/redfish/extended/test_os_reboot.robot
index f2ce7a5..ad2316a 100644
--- a/redfish/extended/test_os_reboot.robot
+++ b/redfish/extended/test_os_reboot.robot
@@ -31,7 +31,7 @@
     # Note: Host Reboot is implemented by the OBMC Boot Test tool.
     # OBMC Boot Test will take the necessary steps to get the OBMC
     # to a host powered on state before attempting the Host Reboot.
-    Repeat Keyword  ${BOOT_LOOP_COUNT} times  Redfish Host Reboot
+    Repeat Keyword  ${BOOT_LOOP_COUNT} times  RF SYS GracefulRestart
 
 *** Keywords ***