Pass through .values.backup.secretData

[j2L4e]

Reverts #11.

Passing through is the easiest way to support any credentials that etcd-backup-restore supports. Noop rewrites were removed.

Edit: I think we should get rid of these rewrites altogether if possible.

[lotharbach]

I'm just not 100% sure what happens when the un-translated keys are also present in the output as well. I don't think it matters and I'm willing to just try it.

With values:

backup:
  storageProvider: ABS
  secretData:
    storage-key: foo
    storage-account: bar

it now produces this secret:

apiVersion: v1
kind: Secret
metadata:
  name: etcd-backup
  namespace: default
type: Opaque
data:
  storage-account: bar
  storage-key: foo
  storageAccount: bar
  storageKey: foo