dnvm run ... and dnvm exec do not set exit code correctly

[dougbu]

dnvm run and dnvm exec do not pass a non-0 exit code from dnx back to the shell. (Side note: This and the _k-test.shade / _k.shade approach means DNX Core tests on Windows can fail without ending the build.)

Repro steps

1. create a simple Console application that always fails
2. dnu restore
3. dnx run
4. echo %ErrorLevel%`

• observe expected 1
  1. dnvm run default run or dnvm exec default dnx run
  2. echo %ErrorLevel%
• observe unexpected 0

Example program

namespace ExitCode
{
    public class Program
    {
        public int Main(string[] args)
        {
            return 1;
        }
    }
}

[muratg]

@dougbu Is this a regression?

[dougbu]

I don't think this ever worked correctly. Not sure why we changed KoreBuild as if it did. @BrennanConroy ??

[BrennanConroy]

4f0b099