(fix) enable custom names for service accounts (#468)

Issue N/A

Allow leaderElection role to be bound to a custom `ServiceAccount` name, similarily to the main cluster role.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Author: therealpandey

templates/helm/templates/leader-election-role-binding.yaml.tpl

@@ -14,6 +14,6 @@ roleRef:
   name: {{.ServicePackageName}}-leader-election-role
 subjects:
 - kind: ServiceAccount
-  name: {{.ServiceAccountName}}
+  name: {{ "{{ include \"service-account.name\" . }}" }}
   namespace: {{ "{{ .Release.Namespace }}" }}
 {{- "{{- end }}" }}