Deployment node selector

[yvespp]

We use nodes to represent a Kubernetes API server. If an application needs to be deployed into multiple cluster on an environment we added multiple node/API servers. Now we like to selectively deploy only on to some nodes at the same time instead of always to all nodes.
Currently nodes can only be enabled/disabled in the configuration, we like to be able to select the nodes to deploy to when creating a new deployment.

Todo:

• Extend backend to be able to select which nodes are active
• Extend rest service:
  • Add node selector, default is all nodes
  • List nodes that where active
• Extend gui
  • Add gui to select active nodes, default is all nodes
  • Show active Nodes in deployment overview
• Add test