use-guide:Update cloud-init version recommend
use-guide:Update cloud-init version recommend

update get the cloud-init from Operating Systems 's Reference for cloud-init version.

Change-Id: I8f976e3fc26b5f791a8825f42f9756909107969a

openstack/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals