Update standard-inventory-qcow2 + unittests
    
    Vastly increase use of debugging function throughout the script.
    Improved logging of monitor process.  Fixed busy-wait of monitor process.
    Fixed handling of $LOCK_ON_FILE in monitor.  Added loud warning if
    $LOCK_ON_FILE is set but file cannot be read.
    
    Updated argument processing to not require --list or --host.
    Also update logging/debugging to support writing to /dev/tty
    along with updates to keep unittests happy.
    
    Signed-off-by: Chris Evich <cevich@redhat.com>