TraceListenerManager is not thread safe

[MarcoRossignoli]

TraceListenerManager can be created in parallel and in the constructor it's setting the static console TextWriter without any lock. So when for instance one test completes and restores the original TextWriter another concurrent Console.WriteLine will pickup wrong writer invalidating the "capture" semantic.

testfx/src/Adapter/MSTestAdapter.PlatformServices/Services/TraceListenerManager.cs

Lines 42 to 43 in 2614300

	Console.SetOut(outputWriter);
	Console.SetError(errorWriter);