apm-server gets fussy about file-permissions

"Exiting: error loading config file: config file
("/etc/apm-server/apm-server.yml") must be owned by the user identifier
(uid=0) or root"

apm-server is normally run under its own user, and permissions on
/etc/apm-server/apm-server.yml reflect that, so we disable the check
while running running `setup` under root.

Change-Id: If25b446b49a29d1ac86261fe632bb6fe791f13ce

elk_metrics_7x/roles/elastic_beat_setup/tasks/main.yml

@@ -47,6 +47,9 @@
       {{ item }}
     {%- endif %}
     {{ elastic_beat_setup_options }}
+    {% if elastic_beat_name == "apm-server" -%}
+      --strict.perms=false
+    {%- endif %}
     -e -v
   with_items: "{{ elastic_setup_flags }}"
   register: templates