Re-integrate pytest-timeout plugin

[Peque]

There used to be a global timeout for tests but the plugin did not get along well with xdist, so I decided to go with parallel tests rather than timed-out tests.

Maybe we should reconsider this or at least check if the situation has changed.

References:

• https://bitbucket.org/pytest-dev/pytest-timeout/issues/8/internalerror-valueerror-signal-only-works
• Timeout with xdist pytest-dev/pytest-xdist#117
• request: pytest-timeout from the side of xdist pytest-dev/pytest-xdist#220
• Warnings generated by pytest-xdist pytest-dev/pytest-xdist#133
• pytest hangs indefinitely after completing tests in parallel pytest-dev/pytest-xdist#60

See also:

• Test process hanging forever pytest-dev/execnet#43

[codecov]

Codecov Report

Merging #198 into master will decrease coverage by 0.22%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #198      +/-   ##
==========================================
- Coverage   99.19%   98.96%   -0.23%     
==========================================
  Files          26       26              
  Lines        3588     3588              
  Branches      257      257              
==========================================
- Hits         3559     3551       -8     
- Misses         16       22       +6     
- Partials       13       15       +2

Impacted Files	Coverage Δ
osbrain/__init__.py	88.88% <0%> (-11.12%)	⬇️
osbrain/nameserver.py	97.65% <0%> (-1.57%)	⬇️
osbrain/tests/test_timer.py	98.05% <0%> (-0.98%)	⬇️

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