CP-18676: Adapt to attach_helper in pool.update.introduce
CP-18676: Adapt to attach_helper in pool.update.introduce

Signed-off-by: Phus Lu <029e184aefbd8f8732df805042602d8618004d6a@citrix.com>

euanh/xen-api,Frezzle/xen-api,thomassa/xen-api,thomassa/xen-api,euanh/xen-api,srowe/xen-api,Frezzle/xen-api,Frezzle/xen-api,Frezzle/xen-api,srowe/xen-api,Frezzle/xen-api,srowe/xen-api,euanh/xen-api,euanh/xen-api,srowe/xen-api,thomassa/xen-api,euanh/xen-api,thomassa/xen-api,euanh/xen-api,thomassa/xen-api,thomassa/xen-api,srowe/xen-api