Added test cases to verify turbo allowed value.

This change includes:
   - Added test cases to verify enable and disable turbo
     allowed via IPMI.
   - Added suite teardown to restore system configuration.
   - Added this test case in skip lists of NA system.

Resolves openbmc/openbmc-test-automation#527

Change-Id: Ifd1e7d93ceb699731e211b1856a5574a9d0fbe17
Signed-off-by: Rahul Maheshwari <rahulmaheshwari@in.ibm.com>
diff --git a/data/Witherspoon.py b/data/Witherspoon.py
index cc3960d..d90012e 100755
--- a/data/Witherspoon.py
+++ b/data/Witherspoon.py
@@ -449,6 +449,7 @@
         0xb6 : '<inventory_root>/system/chassis/motherboard/pcielink',
         0xD8 : '/org/openbmc/sensors/host/PowerSupplyRedundancy',
         0xb4 : '/org/openbmc/sensors/host/PowerSupplyDerating',
+        0xda : '/org/openbmc/sensors/host/TurboAllowed',
     },
     'GPIO_PRESENT' : {}
 }