python/bandit: Use .bandit configuration file

Bandit automatically [uses any .bandit file] within the directories on
which it is invoked.  Since ALE invokes bandit on stdin, it does not
load a .bandit file automatically.  Add support for automatically
finding a .bandit file and passing it to bandit via the --ini option
along with a variable to disable this behavior if desired.

Note: This is useful for the skips and tests configuration options, but
not exclude which would require invoking bandit using a file name, which
may or may not be a good trade-off.

[uses any .bandit file]: https://github.com/PyCQA/bandit/blob/1.5.1/bandit/cli/main.py#L70-L73

Signed-off-by: Kevin Locke <kevin@kevinlocke.name>

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