Add more pod labels

[landorg]

These labels help to distribute nodes across nodes with topologySpreadConstraints. Can be used like this:

  masters:
    topologySpreadConstraints:
      - maxSkew: 1
        topologyKey: kubernetes.io/hostname
        whenUnsatisfiable: DoNotSchedule
        labelSelector:
          matchExpressions:
            - key: app-type
              operator: In
              values:
              - master

  workers:
    topologySpreadConstraints:
      - maxSkew: 1
        topologyKey: kubernetes.io/hostname
        whenUnsatisfiable: DoNotSchedule
        labelSelector:
          matchExpressions:
            - key: app-type
              operator: In
              values:
              - worker