Add localRoot & remoteRoot to the launch.json snippets

[d3r3kk]

For #1385

• Will set localRoot to "${workspaceFolder}" by default
• Will set remoteRoot to "." by default
• PTVSD will (eventually, see Auto-detect root if remote root is not provided ptvsd#691) pick this up and infer "." to be CWD.

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• Pull request represents a single change (i.e. not fixing disparate/unrelated things in a single PR)
• Title summarizes what is changing
• Has a news entry file (remember to thank yourself!)
• Unit tests & system/integration tests are added/updated
• Test plan is updated as appropriate
• package-lock.json has been regenerated by running npm install (if dependencies have changed)

[codecov]

Codecov Report

Merging #3950 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #3950   +/-   ##
======================================
  Coverage      78%     78%           
======================================
  Files         402     402           
  Lines       18572   18572           
  Branches     2985    2985           
======================================
  Hits        14352   14352           
  Misses       4218    4218           
  Partials        2       2

Flag	Coverage Δ
#Linux	68% <ø> (ø)	⬆️
#Windows	68% <ø> (ø)	⬆️
#macOS	68% <ø> (+1%)	⬆️

Impacted Files	Coverage Δ
.../extension/configuration/providers/remoteAttach.ts	93% <ø> (ø)	⬆️

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[DonJayamanne]

Tsk tsk tsk, changes to config alone resolved in a big drop of code coverage... 😁

[d3r3kk]

@DonJayamanne code coverage + consistency. Now there is a failing functional test in CI though (unrelated).

Please have a quick look and let me know if I hit all the beats.

[d3r3kk]

@DonJayamanne ping.