* d/patches/fix-ubuntu-tests.patch: Fixup for new tests location.
* d/patches/ubuntu-test-overrides.patch: Override testing defaults
  using patches.
* d/rules: Rework for patching approach for test_overrides.conf.
* d/tests/test_overrides.conf: Dropped - no longer required.
* d/control: Add python-netaddr to BD's.