Fix Power restore for IPMI

Change-Id: If440e8427052089fa019c10d33b1969e693eac20
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/tests/ipmi/test_chassis.robot b/tests/ipmi/test_chassis.robot
index de70a82..183958c 100755
--- a/tests/ipmi/test_chassis.robot
+++ b/tests/ipmi/test_chassis.robot
@@ -43,7 +43,7 @@
 
      ${initial_power_policy}=  Read Attribute  ${HOST_SETTING}  power_policy
 
-     Set BMC Power Policy  ALWAYS_POWER_ON
+     Set BMC Power Policy  ${ALWAYS_POWER_ON}
      ${resp}=  Run IPMI Standard Command  chassis status
      ${power_status}=
      ...  Get Lines Containing String  ${resp}  Power Restore Policy
@@ -55,7 +55,7 @@
      ...  Get Lines Containing String  ${resp}  Power Restore Policy
      Should Contain  ${power_status}  previous
 
-     Set BMC Power Policy  LEAVE_OFF
+     Set BMC Power Policy  ${ALWAYS_POWER_OFF}
      ${resp}=    Run IPMI Standard Command  chassis status
      ${power_status}=
      ...  Get Lines Containing String  ${resp}  Power Restore Policy