backpressure fix during recovery Issue #74

[patkivikram]

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Description

This fixes issues 74

[codecov-io]

Codecov Report

Merging #75 (283d35b) into master (0a4d059) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master      #75   +/-   ##
=======================================
  Coverage   68.37%   68.37%           
=======================================
  Files          99       99           
  Lines       10349    10349           
  Branches     1164     1164           
=======================================
  Hits         7076     7076           
  Misses       3129     3129           
  Partials      144      144           

Impacted Files	Coverage Δ
faust/transport/consumer.py	39.92% <0.00%> (ø)

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