Add an option to specify extra flags for varnishd

defaults/main.yaml

@@ -18,3 +18,4 @@ varnish:
   logformat: >
     {"time": %{"%FT%T%z"}t, "remote_addr": "%h","remote_user": "%u","x_forwarded_for": "%{X-Forwarded-For}i","x_real_ip": "%{X-Real-IP}i","x_request_id": "%{X-Request-ID}i","hit_miss": "%{Varnish:hitmiss}x","body_bytes_sent": "%b","request_time": "%{Varnish:time_firstbyte}x","status": "%s","content_type": "%{Content-Type}o","request": "%r","host": "%{host}i","request_method": "%m","time_first_byte": "%{Varnish:time_firstbyte}x","handling": "%{Varnish:handling}x","http_referrer": "%{Referrer}i","http_user_agent": "%{User-agent}i"}
   storage: malloc,512M
+  extra_flags: {}

tasks/service-FreeBSD.yaml

@@ -16,6 +16,10 @@
       regexp: "^varnishd_storage="
       line: >
         varnishd_storage="{{ varnish.storage | trim | quote }}"
+    - rc_conf: /usr/local/etc/rc.conf.d/varnishd
+      regexp: "^varnishd_extra_flags="
+      line: >
+        varnishd_extra_flags="{%- for flag,value in varnish.extra_flags.items() -%} -p {{ flag }}={{ value }}{%- endfor -%}"
     - rc_conf: /usr/local/etc/rc.conf.d/varnishncsa
       regexp: "^varnishncsa_logformat="
       line: >