Make it possible to run multiple daemons processes in a single container

[msm-code]

Feature Category

• Correctness
• User Interface / User Experience
• Performance
• Other (please explain)

Describe the problem

Right now the demon is a single process, and the only way to spawn more demons is to create more containers/pods

Describe the solution you'd like

This is a good solution in most cases, but sometimes having one pod/container with daemon per ursadb is simpler from devops point of view. We can add a flag like --scale 4 to daemon, so that it's very easy to run multiprocessed daemon in a single container.

Describe alternatives you've considered

There's nothing wrong with the current approach, but it can be a bit wasteful in some cases.