CP-24337: Refine xapi_vm_lifecycle.ml
CP-24337: Refine xapi_vm_lifecycle.ml

Signed-off-by: Kun Ma <a0654752d70750c00d9512cb63e32ec4c279acb7@citrix.com>

srowe/xen-api,srowe/xen-api,srowe/xen-api,srowe/xen-api,srowe/xen-api