tests/readlink.py

revert: use "discard"/"revert" verb when reverting interactively (issue5143)

Instead of "record this change to 'FILE'?" now prompt with:

* "discard this change to 'FILE'?" when reverting to the parent of working
  directory, and,
* "revert this change to 'FILE'?" otherwise.

#!/usr/bin/env python

from __future__ import print_function

import errno, os, sys

for f in sys.argv[1:]:
    try:
        print(f, '->', os.readlink(f))
    except OSError as err:
        if err.errno != errno.EINVAL:
            raise
        print(f, '->', f, 'not a symlink')

sys.exit(0)