dotnet test verbosity level for test output only

[dee-cf]

If we want to have a list of tests passed in test suite (only overall stats), we need to use at least
dotnet test -v n
verbosity level. But, that one comes with a whole bunch of build output info also.

It would be nice to have a verbosity level that would show tests that were run in suite but without all the build info.

[livarcocc]

This issue was moved to microsoft/vstest#1773