Support cert-manager format

[fao89]

When using cert-manager to generate TLS certs for pulp-operator, we need to 'copy' the data from the secret and reformat it for the container_token_secret.

What we should do, is replace our format with cert-manager format. We can preserve backwards compat but should recommend cert-manager as the default.

apiVersion: v1
kind: Secret
metadata:
name: example-tls
namespace: foo
data:
tls.crt: <base64 encoded cert>
tls.key: <base64 encoded key>
type: kubernetes.io/tls