Fix raw_input on debugger redirect. Fixes #490

[fabioz]

No description provided.

[fabioz]

In tests I referenced things from my work in progress. Closing to fix issue.

[fabioz]

Ok, should be fine now.

[codecov-io]

Codecov Report

Merging #816 into master will increase coverage by 0.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #816      +/-   ##
==========================================
+ Coverage   59.42%   59.54%   +0.11%     
==========================================
  Files          28       28              
  Lines        3914     3915       +1     
==========================================
+ Hits         2326     2331       +5     
+ Misses       1588     1584       -4

Impacted Files	Coverage Δ
ptvsd/pathutils.py	40.9% <0%> (-0.96%)	⬇️
ptvsd/wrapper.py	51.44% <0%> (+0.07%)	⬆️
ptvsd/session.py	77.11% <0%> (+0.84%)	⬆️
ptvsd/daemon.py	48.97% <0%> (+0.87%)	⬆️

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