GUI: Fixed Verify_Canceling_Operation_On_BMC_Reboot_Operation

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

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

Change-Id: I9279d10ef179bf0ab67f4d5a0f8b3da1e1cbcf80
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 0093552..30fb470 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
@@ -45,6 +45,10 @@
     [Tags]  Verify_Canceling_Operation_On_BMC_Reboot_Operation
 
     Click Element  ${xpath_reboot_bmc_button}
+
+    # Delay added for cancel button to appear.
+    Sleep  5s
+
     Click Element At Coordinates  ${xpath_reboot_cancel_button}  0  0
     Wait Until Element Is Not Visible  ${xpath_reboot_cancel_button}  timeout=15