[PATCH] Add test suite function

[Jelmer Vernooij]

These two simple patches add a test_suite() function for python-debian
that can be used with custom Python test runners and change debian/rules
to call that function rather than calling all the test suites
individually.

I've also made the tests cope with running from a cwd that does not
contain the test data.

Cheers,

Jelmer
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