Issue #3266542 by Xiaohua Guan, yas: Create entity type availability zone (OpenStack)

...ice_providers/aws_cloud/src/Form/Ec2/VolumeCreateForm.php

...ice_providers/aws_cloud/src/Form/Vpc/SubnetCreateForm.php

...vice_providers/aws_cloud/src/Traits/AwsCloudFormTrait.php

modules/cloud_service_providers/openstack/openstack.install

...viders/openstack/src/Entity/OpenStackAvailabilityZone.php

...enstack/src/Entity/OpenStackAvailabilityZoneViewsData.php

..._providers/openstack/src/Service/Ec2/OpenStackService.php

...viders/openstack/src/Service/OpenStackBatchOperations.php

...viders/openstack/src/Service/OpenStackRestServiceMock.php

...providers/openstack/src/Service/Rest/OpenStackService.php