add defaults for nginx_extra_events_options

- add defaults for nginx_extra_events_options
- get rid of explicit use method, drop into options

defaults/main.yml

@@ -18,7 +18,12 @@ nginx_vhost_template: "vhost.j2"
 nginx_worker_processes: "{{ ansible_processor_vcpus | default(ansible_processor_count) }}"
 nginx_worker_connections: "1024"
 nginx_multi_accept: "off"
-#nginx_use_method: "epoll"
+
+nginx_extra_events_options: ""
+# Example extra events{} options
+#    nginx_extra_events_options: |
+#      accept_mutex        on;
+#      use                 epoll;
 
 nginx_error_log: "/var/log/nginx/error.log warn"
 nginx_access_log: "/var/log/nginx/access.log main buffer=16k flush=2m"