GUI: Fixed Verify_BMC_Reboot_Operation test case

Changes :-
    - Delay added for confirm button to appear.

Tested :-
    -  Successfully ran this from gui/gui_test/operations_menu/test_reboot_bmc_sub_menu.robot

Change-Id: I1b6fc3c90489cfe5db7ca2191e637ebd56eb28ee
Signed-off-by: rramyasr-in <rramyasr@in.ibm.com>
diff --git a/gui/gui_test/operations_menu/test_reboot_bmc_sub_menu.robot b/gui/gui_test/operations_menu/test_reboot_bmc_sub_menu.robot
index 89d76a8..0093552 100644
--- a/gui/gui_test/operations_menu/test_reboot_bmc_sub_menu.robot
+++ b/gui/gui_test/operations_menu/test_reboot_bmc_sub_menu.robot
@@ -54,6 +54,9 @@
     [Tags]  Verify_BMC_Reboot_Operation
 
     Click Element  ${xpath_reboot_bmc_button}
+
+    # Delay added for confirm button to appear.
+    Sleep  5s
     Click Element At Coordinates  ${xpath_confirm_button}  0  0
 
     # Checks BMC gets into Unpingable state and later becomes Pingable.