tests/unwrap-message-id.py

upgrade: move `printrequirements()` to UpgradeOperation class

Part of refactor where we make things more arranged and integrated into single
`UpgradeOperation` class.

Differential Revision: https://phab.mercurial-scm.org/D9577

from __future__ import absolute_import, print_function

import sys

for line in sys.stdin:
    if line.lower() in ("message-id: \n", "in-reply-to: \n"):
        line = line[:-2]
    print(line, end="")