Seed a default switch to control `automountServiceAccountToken`

Signed-off-by: Pat Riehecky <riehecky@fnal.gov>

pkg/chartutil/create.go

@@ -122,6 +122,8 @@ fullnameOverride: ""
 serviceAccount:
   # Specifies whether a service account should be created
   create: true
+  # Automatically mount a ServiceAccount's API credentials?
+  automount: true
   # Annotations to add to the service account
   annotations: {}
   # The name of the service account to use.
@@ -366,6 +368,7 @@ metadata:
   annotations:
     {{- toYaml . | nindent 4 }}
   {{- end }}
+  automountServiceAccountToken: {{ .Values.serviceAccount.automount }}
 {{- end }}
 `