Fix lang-python-* failures when a traditional French locale is present.

Fix lang-python-* failures when a traditional French locale is present.

This is caused by the new UTF-8 encoded messages in .mo files, together
with a bug in gettext.py from Python 2.7 that prohibits reencoding of the
looked-up messages at run time.

* gettext-tools/tests/lang-python-1: Instead of conditionally skipping the test
in the $LOCALE_FR_UTF8 locale, conditionally skip the test in the $LOCALE_FR
locale.
* gettext-tools/tests/lang-python-2: Likewise.