Merge Debian packaging for release “1:0.12.2-2”.

Merge Debian packaging for release “1:0.12.2-2”.

* wip/packaging/1%0.12.2-2:
  Finalise release “1:0.12.2-2”.
  Declare versioned build dependency on ‘pbr’ library.
  Update my email address for Debian work.
  Document how the source package is built.
  Declare “Standards-Version: 3.9.8”.
  Add configuration for Git-buildpackage.
  Remove superfluous configuration for Bzr-buildpackage.
  Migrate packaging VCS to Git at NotABug.
  Specify directories explicitly during package tests.
  Refine docstrings to make the smoke test module generic.
  Correct change log message.
  Document copyright information for smoke tests.
  Add autopkgtest smoke tests with all Python interpreters.
  Add smoke test suite to verify distribution is installed.
  Document explicit additional grant of license to a file.
  Distinguish license conditions from license grants.
  Acknowledge non-maintainer upload “1:0.10.2-2.1”.
  Update copyright notices.