Remove obsolete spec.Target

[wikkyk]

.spec.Target can be removed in new version, as it's not used anywhere, it's just messing around. If you want to deploy machines on specific Target you can use .spec.AllowedNodes with 1 node.

One another suggestion from my side: move all template choose under: .spec.Templateselector

....
spec:
  template:
    spec:
      templateSelector:
        templateNode: node1
        templateId: 125
....

or

....
spec:
  template:
    spec:
      templateSelector:
        templateTags: 
          - tag1
          - tag2
        localStorage: true
....

this would separate template from all other spec.

Originally posted by @Atoms in #293