hg-to-git: make it compatible with both python3 and python2

Python 2 is EOL at the end of 2019, many distros and systems now
come with python 3 as their default version.

Rewrite features used in hg-to-git that are no longer supported in
Python 3, in such a way that an updated code can still be usable
with Python 2:

 - print is not a statement; use print() function instead.
 - dict.has_key(key) is no more; use "key in dict" instead.

Signed-off-by: Hervé Beraud <herveberaud.pro@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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