Changes to how debug options are passed into the experimental version of PTVSD (debugger)

[DonJayamanne]

Fixes #1168

This pull request:

• Has a title summarizes what is changing
• Includes a news entry file (remember to thank yourself!)
• Has unit tests & code coverage is not adversely affected (within reason)
• Works on all actively maintained versions of Python (e.g. Python 2.7 & the latest Python 3 release)
• Works on Windows 10, macOS, and Linux (e.g. considered file system case-sensitivity)

[codecov]

Codecov Report

Merging #1195 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1195      +/-   ##
==========================================
+ Coverage   71.96%   71.99%   +0.02%     
==========================================
  Files         260      260              
  Lines       11922    11930       +8     
  Branches     2116     2118       +2     
==========================================
+ Hits         8580     8589       +9     
+ Misses       3219     3216       -3     
- Partials      123      125       +2

Impacted Files	Coverage Δ
...lient/debugger/configProviders/pythonV2Provider.ts	100% <100%> (ø)	⬆️
...c/client/debugger/DebugClients/LocalDebugClient.ts	52.41% <100%> (+0.38%)	⬆️
src/client/debugger/Common/Contracts.ts	100% <100%> (+10.41%)	⬆️
...rc/client/debugger/configProviders/baseProvider.ts	93.05% <100%> (+0.09%)	⬆️
src/client/unittests/common/debugLauncher.ts	93.18% <100%> (+0.15%)	⬆️
...rc/client/debugger/PythonProcessCallbackHandler.ts	52.3% <0%> (-1.32%)	⬇️

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