In "List all hosts for a project", service-status should take
the values of ['available', 'unavailable'], (service-state takes
the value of ['enabled', 'disabled']), and because os-services API
uses service_status which requires returning `enabled` and `disabled`,
we need add a new parameter host_service_status for os-hosts API.
https://docs.openstack.org/api-ref/block-storage/v3/index.html#list-all-hosts-for-a-project
partially-implements: blueprint volume-response-schema-validation
Change-Id: Idde4a63f00862599a13bcfcdadc1d4459f27d3a4
d4f1e57257