Auto start topology daemon

[y-higuchi]

Automatically start topology daemon without explicitly running them from DSL .conf file.

[yasuhito]

👍

[y-higuchi]

• Start topology daemon process when someone first used topology API.
  • How to check if a certain controller is running in trema C API.
  • How to start a controller in trema C API.
  • What if multiple controller started to use topology API at the same time.
• Leave topology daemon running once they are started.
  • Do not self terminate even there aren't any subscriber left