Helm: Downgrade needed perimsions for Strimzi Installation

Fixes #388 (closed)

Adds a role for the strimzi-operator and the strimzi-entity-operator. Also adds the corresponding role-bindings.

If the following is set in helm values.yaml helm will install the added resources.

strimzi-kafka-operator:
  createGlobalResources: false

helm/templates/strimzi/entity-role-binding.yaml

+{{- if not (index .Values "strimzi-kafka-operator" "createGlobalResources") -}}
+apiVersion: rbac.authorization.k8s.io/v1
+kind: RoleBinding
+metadata:
+  labels:
+    app: strimzi
+  name: strimzi-cluster-operator-entity-operator-delegation-namespaced
+  namespace: {{ .Release.Namespace }}
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: Role
+  name: strimzi-entity-operator-namespaced
+subjects:
+- kind: ServiceAccount
+  name: strimzi-cluster-operator
+  namespace: {{ .Release.Namespace }}
+{{- end }}
+