Explicit version for kafka session timeout

[a-shkarupin]

As discussed in https://groups.google.com/a/scrapinghub.com/forum/?utm_medium=email&utm_source=footer#!msg/frontera/rCS6b7g6TfU/VhXfeOxHBwAJ

Also noticed that it duplicates #358

[codecov]

Codecov Report

Merging #388 into master will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #388      +/-   ##
==========================================
- Coverage    60.3%   60.26%   -0.05%     
==========================================
  Files          78       78              
  Lines        6145     6145              
  Branches      809      809              
==========================================
- Hits         3706     3703       -3     
- Misses       2265     2267       +2     
- Partials      174      175       +1

Impacted Files	Coverage Δ
frontera/contrib/messagebus/kafkabus.py	88.37% <ø> (ø)	⬆️
frontera/contrib/messagebus/zeromq/__init__.py	81.42% <0%> (-1.64%)	⬇️
frontera/contrib/backends/hbase/__init__.py	68.22% <0%> (ø)	⬆️

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