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Add a promise plugin to check that the current state of a supervisord service matches the expected state.

This is step 2 of a 3-step plan to add an "autorun" feature to theia (See discussion in slapos!888 (merged)):

• Step 1: Add a slapos-node-auto service to slap/standalone: See slapos.core!280 (merged)
• Step 2: Create this generic promise plugin to check the state of a service.
• Step 3: Add an autorun option to software/theia with 3 possible values:
  • running: buildout starts slapos-node-auto and a promise is used to check that it is running
  • stopped: buildout stops slapos-node-auto and a promise is used to check that it is stopped
  • undefined: buildout leaves slapos-node-auto as is, the promise is always fulfilled.