software/theia: Add autorun option

The autorun option aims to control whether slapos node software and slapos node instance should automatically run every minute, and slapos node report every hour. It does this by starting or stopping a service in slap/standalone called slapos-node-auto.

The autorun option has 3 possible values:

• running: buildout starts slapos-node-auto and a promise is used to check that it keeps running
• stopped: buildout stops slapos-node-auto and a promise is used to check that it remains stopped
• undefined: buildout leaves slapos-node-auto as is.