Unit testing of experimental debugger on CI server and packaging PTVSD in extension

[Don Jayamanne (DonJayamanne)]

Fixes #742

[codecov]

Codecov Report

Merging #987 into master will decrease coverage by 0.02%.
The diff coverage is 25%.

@@            Coverage Diff             @@
##           master     #987      +/-   ##
==========================================
- Coverage      64%   63.97%   -0.03%     
==========================================
  Files         260      260              
  Lines       12024    12031       +7     
  Branches     2129     2130       +1     
==========================================
+ Hits         7696     7697       +1     
- Misses       4319     4325       +6     
  Partials        9        9

Impacted Files	Coverage Δ
...c/client/debugger/DebugClients/LocalDebugClient.ts	0% <0%> (ø)	⬆️
src/client/common/constants.ts	100% <100%> (ø)	⬆️
...reter/locators/services/cacheableLocatorService.ts	91.83% <0%> (-2.05%)	⬇️

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