Rework stats over http so that it supports both a config file and the original path parameter

doc/admin-guide/plugins/stats_over_http.en.rst

@@ -67,3 +67,28 @@ and the URL would then be e.g.::
 
 This is weak security at best, since the secret could possibly leak if you are
 careless and send it over clear text.
+
+Config File Usage
+=================
+
+stats_over_http.so also accepts a configuration file taken as a parameter
+
+The plugin first checks if the parameter that was passed in is a file that exists, if so
+it uses that as a config file, otherwise if a parameter exists it assumes that it is meant
+to be used a path value (as if you were not using a config file)
+
+You can add comments to the config file, starting with a `#` value
+
+Other options you can specify:
+
+.. option:: path=
+
+This sets the path value for stats
+
+.. option:: allow_ip=
+
+A comma separated white list of ipv4 addresses allowed to accesss the endpoint
+
+.. option:: allow_ip6=
+
+A comma separated white list of ipv6 addresses allowed to access the endpoint