watch with double go routines

[alex-schneider]

closes #692

---

Reviewer checklist

• Read PR description: a summary about the changes is required
• Changelog updated
• Documentation: docs/{Reference, Cli, ...}, Docker and cli help/usage
• Pulled branch, manually tested
• Verified requirements are met
• Reviewed the code
• Reviewed the related tests

[johakoch]

handler/transport/probe.go:

    // do not start go-routine on config check (-watch)
    if _, exist := opts.Context.Value(request.ConfigDryRun).(bool); exist {
        return
    }

    if _, exist := tc.Context.Value(request.ConfigDryRun).(bool); !exist {
        go p.probe(opts.Context)
    }

Looks like the first part already tries to solve the problem. Why does it not work?