Fix error in windows provider when the environment has accidental duplicates that differ only by case#6489

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TravisEz13 merged 4 commits intoPowerShell:masterfrom

mklement0:windows_env

Mar 27, 2018

Commits on Mar 24, 2018

fix error in windows provider when the environment as an existing set of variables name that only differs by case
mklement0
committed
switched from .Add() with exception handling to .TryAdd() with `if`
mklement0
committed

Commits on Mar 26, 2018

Make the test a separate, scenario test.
mklement0
committed

Commits on Mar 27, 2018

Remove extraneous empty lines.
mklement0
committed