fix for bz 161352
    
    Adds support for latest ilo firmware version (1.75).  Changes were also
    added to make sure that power status of the machine is being properlly
    checked after power change commands have been issued.  Before, it was
    assumed to work through the messages recieved in the xml response.  As a
    result, systems with APCI  enabled would soft power off leaving, systems
    running instead of properlly fencing them.
    
    A new option, ribcl,  was added to the agent to force the protocol to use
    when trying to send the power off command.  Setting this value to "2.21"
    might be required to work around some versions of ilo on machines with APCI
    enabled.  If left blank, the protocol version is autodetected.