Support for parallel test coverage

[Peque]

Depends on #270.

Fixes #173.

[codecov[bot]]

Codecov Report

Merging #271 into master will increase coverage by 0.11%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #271      +/-   ##
==========================================
+ Coverage   99.03%   99.15%   +0.11%     
==========================================
  Files          26       26              
  Lines        3532     3542      +10     
  Branches      252      256       +4     
==========================================
+ Hits         3498     3512      +14     
+ Misses         21       18       -3     
+ Partials       13       12       -1

Impacted Files	Coverage Δ
osbrain/tests/test_logging.py	100% <100%> (ø)	:arrow_up:
osbrain/tests/test_nameserver.py	98.11% <100%> (ø)	:arrow_up:
...ain/tests/test_agent_sync_publications_handlers.py	98.27% <100%> (ø)	:arrow_up:
osbrain/tests/test_agent_ipc_sockets.py	100% <100%> (ø)	:arrow_up:
osbrain/tests/test_helper.py	100% <100%> (ø)	:arrow_up:
osbrain/tests/test_agent_transport.py	96.38% <100%> (+2.4%)	:arrow_up:
osbrain/tests/test_agent_req_rep.py	100% <100%> (ø)	:arrow_up:
osbrain/tests/test_proxy.py	100% <100%> (ø)	:arrow_up:
osbrain/proxy.py	100% <100%> (ø)	:arrow_up:
osbrain/tests/test_agent_pubsub_topics.py	100% <100%> (ø)	:arrow_up:
... and 10 more

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[Peque]

@ocaballeror It seems GitHub did not correctly update this PR (or at least not as I would have expected). (0f1a06be8ad47a578a42423d6c264428598b7fbc, 1d621e54c85405438f2cfd5a047ceb5c960a2df8, 0363f0a462c2c33ae5e36a83009e2e07f5989fb3) are already in master, so this PR is actually only the last commit of the 4: 0d481985ec97a45d96b05cee920e4de43e8add9a (really small one)