Review Deployments API and remove unused APIs

[jiekang]

Parent: #2636

The deployments page is in a stable position and barring UX overhauls, uses a stable set of APIs. The API [1] should be reviewed and any unused endpoints should be removed.

[1] https://github.com/fabric8-services/fabric8-wit/blob/master/design/deployments.go

[jiekang]

API that is currently being used by the UI:

Scale pods: deployments/spaces/${spaceId}/applications/${applicationId}/deployments/${environmentName}?podCount=${desiredReplicas}

Preload timeseries:
deployments/spaces/${spaceId}/applications/${applicationId}/deployments/${environmentName}/statseries?start=${startTime}&end=${endTime}

Poll timeseries:
deployments/spaces/${spaceId}/applications/${applicationId}/deployments/${environmentName}/stats

Get environments:
deployments/spaces/${spaceId}/environments

Get applications:
deployments/spaces/${spaceId}

Delete deployment:
deployments/spaces/${spaceId}/applications/${applicationId}/deployments/${environmentName}

[jiekang]

Closing as fix has been merged.