Add import imp.reload

[rodrigc]

https://twistedmatrix.com/trac/ticket/9070

[codecov-io]

Codecov Report

Merging #730 into trunk will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##            trunk     #730      +/-   ##
==========================================
+ Coverage   91.27%   91.28%   +<.01%     
==========================================
  Files         844      844              
  Lines      147691   147694       +3     
  Branches    13069    13069              
==========================================
+ Hits       134807   134816       +9     
+ Misses      10639    10634       -5     
+ Partials     2245     2244       -1

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[rodrigc]

This reduces warnings when pyflakes is run under Python 3

[exarkun]

Uh, commit message? And stuff?