Switch to using suspend-all/resume-all command

[karthiknadig]

#732

[codecov-io]

Codecov Report

Merging #775 into master will increase coverage by 0.07%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master     #775      +/-   ##
==========================================
+ Coverage   59.68%   59.75%   +0.07%     
==========================================
  Files          27       27              
  Lines        3879     3876       -3     
==========================================
+ Hits         2315     2316       +1     
+ Misses       1564     1560       -4

Impacted Files	Coverage Δ
ptvsd/wrapper.py	51.38% <33.33%> (-0.11%)	⬇️
ptvsd/session.py	77.11% <0%> (+0.84%)	⬆️
ptvsd/daemon.py	48.97% <0%> (+0.87%)	⬆️

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