This commit adds the appropriate clients and tests for the following
Shipyard API actions:
- `workflow_orchestrator:action_deploy_site`
- `workflow_orchestrator:action_update_site`
- `workflow_orchestrator:action_update_software`
- `workflow_orchestrator:action_redeploy_server`
- `workflow_orchestrator:get_site_statuses`
Change-Id: Ida48ec860dc7cd0842c65c662a50ec3d67c41b77