Test enclosure fault led after assertion on CPU LED.

This change includes:
   - Added test case to verify enclosure fault LED on assertion.
   - Moved "Get System LED State" keyword from led.robot into utils.robot.
   - Added the test case in skip list of barrelye and palmetto as it is NA.

Resolves openbmc/openbmc-test-automation#432

Change-Id: Ic57b488a2087e18fd5e690d800ab4ac2e08eac2b
Signed-off-by: Sweta Potthuri <spotthur@in.ibm.com>
diff --git a/test_lists/skip_test_palmetto b/test_lists/skip_test_palmetto
index 48edf3d..f5fccb2 100644
--- a/test_lists/skip_test_palmetto
+++ b/test_lists/skip_test_palmetto
@@ -48,3 +48,4 @@
 # System LED test cases which are NA for Palmetto system.
 -e Test_Beep_LED_And_Verify_Via_REST
 -e Test_Fault_LED_And_Verify_Via_REST
+-e Verify_Enclosure_Fault_LED_On_Assertion