Merge "Support configuration of swap"

ansible/inventory/group_vars/all/compute

ansible/inventory/group_vars/all/controllers

ansible/inventory/group_vars/all/infra-vms

ansible/inventory/group_vars/all/monitoring

ansible/inventory/group_vars/all/seed

ansible/inventory/group_vars/all/seed-hypervisor

ansible/inventory/group_vars/all/storage

ansible/inventory/group_vars/compute/swap

ansible/inventory/group_vars/controllers/swap

ansible/inventory/group_vars/infra-vms/swap

ansible/inventory/group_vars/monitoring/swap

ansible/inventory/group_vars/seed-hypervisor/swap

ansible/inventory/group_vars/seed/swap

ansible/inventory/group_vars/storage/swap

ansible/overcloud-host-configure.yml

ansible/roles/swap/defaults/main.yml

ansible/roles/swap/files/schema.json

ansible/roles/swap/tasks/main.yml

ansible/swap.yml

doc/source/configuration/reference/hosts.rst