Add logic to power off the host in test suite

Changes:
   - Added host power off code to prevent dump offload
     so that dump can be deleted.

Tested:
    Ran suite redfish/managers/test_bmc_dumps.robot

Signed-off-by: manashsarma <manashsarma@in.ibm.com>
Change-Id: I971f762f464cec63437720d1a9894ce193e1e7c8
diff --git a/redfish/managers/test_bmc_dumps.robot b/redfish/managers/test_bmc_dumps.robot
index 416c690..190afba 100644
--- a/redfish/managers/test_bmc_dumps.robot
+++ b/redfish/managers/test_bmc_dumps.robot
@@ -115,6 +115,9 @@
     [Documentation]  Delete all user initiated BMC dumps and verify.
     [Tags]  Delete_All_User_Initiated_BMC_Dumps_And_Verify
 
+    # Power off host so that dump is not offloaded to host OS.
+    Redfish Power Off  stack_mode=skip
+
     # Create some BMC dump.
     Create User Initiated BMC Dump Via Redfish
     Create User Initiated BMC Dump Via Redfish