Normalized run_once_, made openresty handlers without when aviable and forced flush in run_once when blocks to avoid handlers with when conditions

tasks/utils/run_once.yml

@@ -0,0 +1,8 @@
+---
+# This is necessary to flush the handlers before the when is set, because otherwise the when will be attached to the handlers
+
+- meta: flush_handlers
+
+- name: Set “run-once” fact for role {{ role_name }}
+  set_fact:
+    "{{ 'run_once_' + (role_name | lower | replace('-', '_')) }}": true