python: Set a default-key into gpg.conf for the tests.
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python: Set a default-key into gpg.conf for the tests.

* lang/python/tests/Makefile.am (gpg.conf): Set a default key.

It seems we need to set a default key because at least t-sign.py does
not specify the key to use and we do not want to rely on the order of
keys in the keyring.

Also

gpg 2.0 is end-of-life and we don't need these extra options anymore.
In fact they for the use of some gpg version and don't use the version
gpgconf knows about. This also aligns the python tests to what we use
for the C test suite.