Remove resources that are not needed to run cluster capacity analysis.

[aveshagarwal]

@derekwaynecarr

I have reduced resource further to only pods and nodes. With this and RBAC, the only role that is needed to run cluster capacity is:

kind: ClusterRole
apiVersion: v1
metadata:
  name: cc-role
rules:
- apiGroups: [""]
  resources: ["pods", "nodes",  "persistentvolumeclaims", "persistentvolumes", "services"]
  verbs: ["get", "watch", "list"]

[aveshagarwal]

@derekwaynecarr as per our discussion, I have updated this PR to only remove replication controllers and replica sets.

The 2nd commit is just to fix gofmt error found in the downstream openshift/cluster-capacity code.

[aveshagarwal]

@derekwaynecarr I am going to merge it now, let me know if you see any issues.