Check "Front and Rear LED" state by LED group

Not all the platforms have the same physical LEDs but they all have the
same LED group for indentify LED.

Change-Id: Idfd18668e9fcb8ab32f2651719f21ab6f485e334
Signed-off-by: Alvin Wang <alvinwang@msn.com>
diff --git a/tests/test_basic_poweron.robot b/tests/test_basic_poweron.robot
index 052597d..ad4db6f 100644
--- a/tests/test_basic_poweron.robot
+++ b/tests/test_basic_poweron.robot
@@ -52,7 +52,7 @@
     [Tags]  Verify_Front_And_Rear_LED_At_Standby
 
     REST Power Off  stack_mode=skip  quiet=1
-    Verify Identify LED State  Off
+    Verify Identify LED State  ${0}
 
 
 Verify Application Services Running At Standby