Support deploying external agents with the machines watcher

[ripienaar]

Later we'll rename it to plugins watcher once its properly generic.

• [x] New generic plugins watcher created, heavily machines watcher based so the basic mechanics are known. It's just been made generic
  • [x] Various just renames for machines -> plugins
  • [x] Target dir made configurable rather than assume machines dir - defaults to machines dir
  • [x] Prefix of manager machines configurable from previous hardcoded mm_, this allows agent x and machine x to be managed correctly. Defaults to mm_
  • [x] Machines manager auto agent plugin recreated on plugins
  • [ ] External Agents manager auto agent plugin created like machines manager
  • [x] Integrated for testing into choria compose
• [x] Old mms command moved to choria machine plugins pack allowing us space to iterate there around things like validation etc
• [x] Old machines watcher kept - and not compiled in as before - for those relying on it
• [ ] Docs updated for new plugins watcher not machines watcher

[jeffmccune]

You're probably aware, but just an FYI the choria machine mms command isn't plumbed to match the docs yet. I took a stab but wasn't sure if this should be part of the new plugin system. Only mention it in off chance it was overlooked.

[jeffmccune]

Never-mind, I see it: choria machine plugins pack

[ripienaar]

Yeah sorry about that been a bit of turbulence here as I realised it would be impossible to get the “machines” watcher to be more generic and keep working as before.

So there is a plugins watcher now that’s almost identical but can also handle rpc agents and more.

Docs not updated for that will try today.

Such is life on main I am afraid