redis 2nd cluster in 2nd namespace not supported out of the box

[doronl]

1. Only the cluster role should be under {{- if .Values.global.rbac.create }}, the rest (role, rolebinding, serviceaccount etc.) should be created for the 2nd operator and the 2nd namespace
2. The ClusterRoleBinding should have a unique name per release/namespace
   e.g:

metadata:
  name:  {{ .Release.Namespace }}-redis-operator