tests: helper to copy files from one host to another
    
    Simple function that takes a list of file names and copies
    them from one host to another.
    
    It isn't the most efficient but for a small number of files it
    should be sufficient.
    
    Signed-off-by: Rob Crittenden <rcritten@redhat.com>
    Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>