Stop overriding log output in plugin.Serve in tests #666
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When testing, we don't want to override where log output gets sent--the
test framework takes care of that itself. go-plugin has disabled its use
of log.SetOutput for us, but #639 introduced a log.SetOutput in
plugin.Serve. This adds a plugin.ServeOpt property to disable that
log.SetOutput call so we can finally have tests where log lines don't
randomly show up in test output.