Address PR feedback

Author: stephentoub

src/Common/tests/System/Diagnostics/RemoteExecutorConsoleApp/RemoteExecutorConsoleApp.cs

@@ -11,7 +11,7 @@ namespace RemoteExecutorConsoleApp
     /// <summary>
     /// Provides an entry point in a new process that will load a specified method and invoke it.
     /// </summary>
-    static class Program
+    internal static class Program
     {
         static int Main(string[] args)
         {

src/Common/tests/System/Diagnostics/RemoteExecutorTestBase.cs

@@ -91,8 +91,7 @@ private static RemoteInvokeHandle RemoteInvoke(MethodInfo method, string[] args,
             {
                 FileName = HostRunner,
                 Arguments = TestConsoleApp + " \"" + a.FullName + "\" " + t.FullName + " " + method.Name + " " + string.Join(" ", args),
-                UseShellExecute = false,
-                CreateNoWindow = false
+                UseShellExecute = false
             };
 
             // Profilers / code coverage tools doing coverage of the test process set environment