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eec350c38b
We already have the ability to start a subprocess and hook it up to a Socket, for running local proxy commands. Now the same facility is available as an auxiliary feature, so that a backend can start another subcommand for a different purpose, and make a separate Socket to communicate with it. Just like the local proxy system, this facility captures the subprocess's stderr, and passes it back to the caller via plug_log. To make that not look silly, I had to add a system where the "proxy:" prefix on the usual plug_log messages is reconfigurable, and when you call platform_start_subprocess(), you get to pass the prefix you want to use in this case.