Auto-load ks.cfg if OEMDRV volume available. (#1057271)
    
    This checks if there are any OEMDRV labelled storage volumes available--
    if yes, load a ks.cfg file from that.
    
    This should only happen if a user has not manually specified a ks=
    option themselves.
    
    Additionally, this checks for a boot arg inst.ks=none, to explicitly
    disable autoloading of ks.cfg from any detected OEMDRV volumes.
    
    Resolves: rhbz#1057271