Add support for `required_cluster_stack`
Add support for `required_cluster_stack`

This is simply passed-through to the SMAPIv2.

Signed-off-by: David Scott <63c9eb0ea83039690fefa11afe17873ba8278a56@citrix.com>

xapi-project/message-switch,xapi-project/message-switch,xapi-project/message-switch