update the nova host aggregates links
update the nova host aggregates links

https://docs.openstack.org/nova/latest/admin/aggregates.html link failure,
From openstack U version, this link is not in the user directory. Currently, only the latest version has been changed.
You are advised to change all the links

Change-Id: Ic3b5a0ac7d832b162848b363396264ed0bfc4a25

mahak/neutron,openstack/neutron,mahak/neutron,mahak/neutron,openstack/neutron,openstack/neutron