Rename App Context name for enabling Managed SNI on Windows

[cheenamalhotra]

• Remove ConfigurationManager dependency from nuspec
• Standardize App Context switch name for "UseManagedNetworkingOnWindows"

[David-Engel]

If you are updating the switch name, you'll also need to update the BUILDGUIDE and DataTestUtility.cs. Then I assume the pipeline will need to be updated, too.

[David-Engel]

If you are updating the switch name, you'll also need to update the BUILDGUIDE and DataTestUtility.cs. Then I assume the pipeline will need to be updated, too.

Looks like you just did that. :)

[David-Engel]

Be sure to think about what the pipelines should look like for building slightly older code, too. Since this switch just came out in 2.0 previews, maybe we don't need to support the previous name.

[cheenamalhotra]

Be sure to think about what the pipelines should look like for building slightly older code, too. Since this switch just came out in 2.0 previews, maybe we don't need to support the previous name.

Pipelines are run based on config.json property UseManagedSNIOnWindows which is untouched, and AppContext name is taken care in DataTestUtility, so we are good :)