The test caching layer had two bugs around re-hydrating the test resutls from cache:

- Made a bad assumption about the name of the file.
- Assumed tests were always rehydrated into the original directory.

closes #8860

The script for creating / uploading the NuGet file was failing to include the .nuget directory in the ZIP file.  That caused everything to be unpacked to ~\packages instead of ~\.nuget\packages.

The previous PR worked because the new packages weren't being actively used in the master branch (consumed in a child branch that's a WIP).  This PR corrects the issue in the upload scripts and re-generated the ZIP.

by removing `<DebugType>` lines from projects that import `VSL.Settings.targets`

Also include a 'git fetch upstream' step for the people doing
merges.  This is useful if they aren't already up to date.

Ensured that all uses of app.config in our product / test code base is
used in the lower case form.  This helps with our Unix efforts where
mixing the case can be significant.  Updated all of the project
references to ensure they used the lower case version as well.

also make merge branch name easier to read, changing from
  `master-future-2015-01-01-00-00-00`
to
  `merge-master-into-future-20150101-000000`

This simplifies navigating between them in the Solution Explorer.

ResultsFilePath can be null in cases where xunit failed to save one. so rather than using ResultsFilePath
to figure out ResultDir, we will save the dir in the TestResult along with the filepath.

Some of our generators were embedding timestamps in the output files as comments.  This was indirectly preventing us from producing determistic builds as every rebuild came from different content.

Issue #7270 is tracking changing determinism to not be influenced by the comments.  Short term though changing this from using a time stamp (which changes and doesn't have meaning between machines) to outputing the checksum of the input file it ran against.