Add openshift_docker_gc role to upgrade path

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1599341

playbooks/openshift-hosted/private/upgrade.yml

@@ -14,3 +14,8 @@
       name: openshift_hosted
       tasks_from: upgrade_registry.yml
     when: openshift_hosted_manage_registry | default(True) | bool
+  - import_role:
+      name: openshift_docker_gc
+    when:
+    - openshift_use_crio | default(False) | bool
+    - openshift_crio_enable_docker_gc | default(True) | bool