Fix #1246: Separate stderr and stdout streams in ExecWebSocketListener #1268
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Fixes #1246 - brief summary of issue: the exec listener was changed to combine stderr with stdout
This PR just reverts those changes so that stderr is properly written to the stderr stream and kept separate from stdout.
If adding a simple way for people to use the exec api through the client would be useful, @PaulFurtado described what we've written to do this in this comment. We'd be happy to take a look at adding something similar to the client.