Add kuryr prechecks for zun

the zun is need kuryr to be enabled[0], add it into
prechecks is a good idea.

[0]: https://docs.openstack.org/zun/latest/install/compute-install-ubuntu.html#install-and-configure-components

Change-Id: I4f46907c9b47b9108a9aa7bfbd668b833db420af

ansible/roles/zun/tasks/precheck.yml

@@ -27,3 +27,11 @@
   when:
     - container_facts['zun_wsproxy'] is not defined
     - inventory_hostname in groups['zun-wsproxy']
+
+- name: Ensure kuryr enabled for zun
+  run_once: True
+  local_action: fail msg="kuryr is required but not enabled"
+  changed_when: false
+  when:
+    - enable_zun | bool
+    - not enable_kuryr | bool