[otci] misc enhancements (#7104)
[otci] misc enhancements (#7104)


abtink/openthread,openthread/openthread,abtink/openthread,jwhui/openthread,abtink/openthread,srickardti/openthread,jwhui/openthread,abtink/openthread,srickardti/openthread,openthread/openthread,openthread/openthread,openthread/openthread,srickardti/openthread,jwhui/openthread,srickardti/openthread,jwhui/openthread