qemu: Also treat directories properly when using namespaces
    
    When recreating folders with namespaces, the directory type was not
    being handled at all.  It's not special, we probably just didn't know
    that that can be used as a volume path as well.  The code failed
    gracefully, but we want to allow that so that we can use 
    type='dir'> in domains again.
    
    Partially-resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1443434
    
    Signed-off-by: Martin Kletzander <mkletzan@redhat.com>