Implement support for Pod Security Policies (PSPs)

[prydie]

https://kubernetes.io/docs/concepts/policy/pod-security-policy/

Example: https://github.com/coreos/etcd-operator/blob/master/doc/user/spec_examples.md#custom-pod-security-context

[MadalinaPatrichi]

Isn't this handled automatically via the use of Stateful Sets?

[prydie]

@MadalinaPatrichi It is handled in the StatefulSet via .spec.template. The StatefulSet is an implementation detail that we don't expect users to manipulate directly, however. We just need to add a field to our Cluster resource and then pass that down to the StatefulSet.

[KashifSaadat]

I believe this is now covered via PR #218