This change updates the namespace-config chart to (optionally) create
RBAC rules allowing service accounts in the namespace 'use' access to an
existing Pod Security Policy in the cluster. The policy is specified as:
podSecurityPolicy:
existingPsp: name-of-existing-psp
This aligns with the PSP deprecation guidance provided to date [0],
which suggests easing the transition to the "PSP Replacement Policy" by
establishing the standard PSPs (Restricted, Baseline, and Privileged),
assigning a cluster-wide default, and binding more-permissive policies
as needed in certain namespaces.
[0] https://kubernetes.io/blog/2021/04/06/podsecuritypolicy-deprecation-past-present-and-future/
Change-Id: I46da230abf822e0cc3553561fd779444439c34a7
3c4ebf0172