[PATCH 2/6] python: add default arg to get_config_list

[l-m-h at web.de]

It makes the function a little more intuitive to use and does not
diverge much from the original function signature.

Also an example is added to the docstring.
---
 bindings/python/notmuch/database.py | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

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