Updates specs to use new rails5 format.
The old format:
`get :show, { some: params }, { some: headers }`
The new format:
`get :show, params: { some: params }, headers: { some: headers }`
- Add pages javascripts to intialize clusters for group pages
- Move specs asserting gcp specific validations from controller into
UpdateService spec
- Also teach Clusters::ApplicationController about groups