floppy vdsm hook
================
adding floppy to livbirt domain entry:

syntax:
floppy=/path/to/vfd

<disk type='file' device='floppy'>
    <source file='/home/iso/my.vfd'/>
    <target dev='fda' />
</disk>

Note:
    some linux distro need to load the floppy disk kernel module:
    # modprobe floppy

Syntax:
floppy: floppy=/path/to/vfd

Add floppy to VM
