Feat/separate concurrency

[greyfenrir]

Each PR must conform to Developer's Guide.

Quick checklist:

• Description of PR explains the context of change
• Unit tests cover the change, no broken tests
• No static analysis warnings (Codacy etc.)
• Documentation update ('available in the unstable snapshot' warning if necessary)
• Changes file inside site/dat/docs/changes directory, one-line note of change inside

[codecov-commenter]

Codecov Report

Merging #85 (d43b3a7) into master (d3b4fc8) will decrease coverage by 2.74%.
The diff coverage is 90.85%.

@@            Coverage Diff             @@
##           master      #85      +/-   ##
==========================================
- Coverage   92.99%   90.25%   -2.73%     
==========================================
  Files         117       68      -49     
  Lines       29401    18233   -11168     
==========================================
- Hits        27338    16455   -10883     
+ Misses       2063     1778     -285     

Impacted Files	Coverage Δ
bzt/engine/templates.py	85.72% <ø> (+5.72%)	⬆️
bzt/modules/_apiritif/__init__.py	100.00% <ø> (ø)
bzt/modules/_apiritif/jmeter_functions.py	92.31% <ø> (ø)
bzt/modules/functional.py	93.26% <ø> (ø)
bzt/cli.py	81.87% <53.13%> (-2.85%)	⬇️
bzt/modules/monitoring.py	89.74% <65.12%> (-1.47%)	⬇️
bzt/modules/jmeter.py	85.23% <73.59%> (-0.89%)	⬇️
bzt/modules/tsung.py	88.86% <80.00%> (+0.37%)	⬆️
bzt/bza.py	86.20% <80.56%> (+0.54%)	⬆️
bzt/modules/ab.py	90.97% <83.34%> (-0.47%)	⬇️
... and 122 more

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