OpTestSystem: Set state to UNKNOWN on Hostboot IPMI shutdown
OpTestSystem: Set state to UNKNOWN on Hostboot IPMI shutdown

This *forces* us to ensure the host is off and in a known state
before we go and continue.

Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.vnet.ibm.com>

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