Pytest-services

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- 42: Retry on ``zc.lockfile.LockError`` in ``file_lock``, use existing timeout kwarg (mshriver)

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- 38: Retry to lock resource if zc.lockfile.LockError is raised. Fix needed for pytest-xdist. (StabbarN)

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- 34: Deprecated ``slave_id`` fixture in favor of ``worker_id``,
for compatibility with ``pytest-xdist`` 2.

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- 20: Added workaround for issue with SysLogHandler.

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- 23: Rely on ``zc.lockfile`` for lockfile behavior.
- 28: Fixtures now supports later versions of mysql and no longer
support versions of mysql prior to ``mysql --initialize`` support.
- 29: Fix issues with later versions of mysql where ``mysql_defaults_file``
fixture would prevent startup of mysql.
- Fixed issue in test suite where mysql fixture was not tested.
- Removed ``pytest_services.locks.lock_file``.

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- Fix race condition causing when using port_getter/display_getter (youtux)