tests: Set HOME environment variable and work around bzr race condition

Jürg Billeterrequested to merge
juerg/tox-home into master

This sets the HOME environment variable in tox.ini and setup.cfg to fix host contamination when running the test suite.

This also works around a TOCTTOU race condition in bzr's creation of ~/.bazaar in ensure_config_dir_exists() when running tests in parallel.

Edited by Jürg Billeter

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