tox: use deps for pluggymaster testenvs

[blueyed]

tox-dev/tox#706 has been fixed.

[codecov]

Codecov Report

Merging #4762 into master will decrease coverage by 54.52%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #4762       +/-   ##
===========================================
- Coverage   95.68%   41.16%   -54.53%     
===========================================
  Files         113       93       -20     
  Lines       25001    20906     -4095     
  Branches     2484     2258      -226     
===========================================
- Hits        23923     8606    -15317     
- Misses        762    11680    +10918     
- Partials      316      620      +304

Flag	Coverage Δ
#docs	?
#doctesting	?
#linting	?
#linux	41.16% <ø> (-54.35%)	⬇️
#nobyte	?
#numpy	41.16% <ø> (-51.93%)	⬇️
#pexpect	41.16% <ø> (-0.9%)	⬇️
#py27	41.16% <ø> (-52.53%)	⬇️
#py34	?
#py35	?
#py36	?
#py37	?
#trial	41.16% <ø> (-51.93%)	⬇️
#windows	?
#xdist	?

Impacted Files	Coverage Δ
testing/test_pastebin.py	0% <0%> (-100%)	⬇️
testing/test_resultlog.py	0% <0%> (-100%)	⬇️
testing/test_pluginmanager.py	0% <0%> (-100%)	⬇️
testing/test_entry_points.py	0% <0%> (-100%)	⬇️
testing/test_doctest.py	0% <0%> (-100%)	⬇️
testing/test_runner_xunit.py	0% <0%> (-100%)	⬇️
testing/test_pathlib.py	0% <0%> (-100%)	⬇️
testing/test_nodes.py	0% <0%> (-100%)	⬇️
testing/deprecated_test.py	0% <0%> (-100%)	⬇️
testing/test_stepwise.py	0% <0%> (-100%)	⬇️
... and 92 more

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[RonnyPfannschmidt]

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