Merge "Optimize reconfigure action for horizon"

ansible/roles/horizon/defaults/main.yml

ansible/roles/horizon/handlers/main.yml

ansible/roles/horizon/tasks/bootstrap_service.yml

ansible/roles/horizon/tasks/config.yml

ansible/roles/horizon/tasks/deploy.yml

ansible/roles/horizon/tasks/precheck.yml

ansible/roles/horizon/tasks/pull.yml

ansible/roles/horizon/tasks/reconfigure.yml

ansible/roles/horizon/tasks/start.yml

ansible/roles/horizon/tasks/upgrade.yml