Fix permissions on /etc for munge service

The munge service does not start if permissions on /etc are too wide:

    munged: Error: Keyfile is insecure: group-writable permissions without sticky bit set on "/etc"

Author: priteau

tasks/runtime.yml

@@ -105,6 +105,10 @@
   changed_when: false # so molecule doesn't fail
   become: no
 
+- name: Fix permissions on /etc for Munge service
+  mode: g-w
+  path: /etc
+
 - name: Ensure Munge service is running
   service:
     name: munge