fix(instance): query process managers in dev & prod if running not set

[acburdine]

closes #463

• query each process manager if running is not set in cli config

[coveralls]

Coverage increased (+0.009%) to 98.597% when pulling 2c5f084 on acburdine:fix/is-running into dce09e1 on TryGhost:master.

[kirrg001]

Just leaving this here.

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You have a dev and prod config file. Both use the local process manager. You start your development blog (ghost start). Then you loose the information that your instance is running in your .ghost-cli file. You do ghost ls and it would show that production is running. This could be solved by writing the PID including the env information?

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You install a production blog on linux. Then you run cp config.production.json config.development.json. No modifications. You stop your blog. Your run ghost start and you will see running (development). Not sure how that is possible.

[kirrg001]

Feel free to self merge after the fix for the second case 👍 We will ignore the first case for now, because it is not critical.