OpTestIPMI: Improve standby check by using power status
OpTestIPMI: Improve standby check by using power status

Executing an ipmi sdr elist command takes long time(When remote machine
is in different subnet), instead of that power status gives us same
standby state after a power off operation. So lets use that.

Signed-off-by: Pridhiviraj Paidipeddi <fd8ea14509c256cbd04eaa4ee745a213945e70a1@linux.vnet.ibm.com>

open-power/op-test-framework,open-power/op-test-framework,open-power/op-test-framework