Comment 9 for bug 1552042

Forgot this (which is also lacking nodev):

2444 def _mount_filesystem(dev_path, dir):
2445 """mounts the device specified by dev_path in dir."""
2446 try:
2447 _out, err = utils.execute('mount',
2448 '-t', 'ext2,ext3,ext4,reiserfs',
2449 dev_path, dir, run_as_root=True)