* Add net461 TFM to netstandard2.0 projects
* Fix a couple of errors
* Fix some errors
* Get rid of Sockets reference
* Respond to feedback
* net461 -> property
* Fixup clientSample
* Remove net461 from analyzers/razor
* Remove net461 from test projects
* Feedback
* Add net461 test configs
* Remove some incompatible test configs
* Fix test
.NET Core 2.0 reached EOL last year. This removes multi-targeting our test projects and test assets to only use .NET Core 2.1 and .NET Framework 4.6.1.\n\nCommit migrated from 084494d21d