Adding missing deprecated var openshift_hosted_metrics_public_url and its mapped var

roles/openshift_sanitize_inventory/tasks/__deprecations_metrics.yml

@@ -15,3 +15,4 @@
       openshift_metrics_image_version: openshift_hosted_metrics_deployer_version
       openshift_metrics_install_metrics: openshift_hosted_metrics_deploy
       openshift_metrics_storage_kind: openshift_hosted_metrics_storage_kind
+      openshift_metrics_hawkular_hostname: openshift_hosted_metrics_public_url

roles/openshift_sanitize_inventory/vars/main.yml

@@ -74,3 +74,4 @@ __warn_deprecated_vars:
   - 'openshift_hosted_metrics_storage_labels'
   - 'openshift_hosted_metrics_deployer_prefix'
   - 'openshift_hosted_metrics_deployer_version'
+  - 'openshift_hosted_metrics_public_url'