Support for dynamic ip ranges from urls

- Adds ipranges command to fetch ip ranges from Cloudfront and Cloudflare
- Write the ipranges file on docker start
- Support disabling ipv4 as well as ipv6 now
- Prevent disabling both

docker/rootfs/etc/nginx/conf.d/include/ip_ranges.conf

@@ -1,2 +0,0 @@
-# This should be left blank is it is populated programatically
-# by the application backend.

docker/rootfs/etc/nginx/nginx.conf

@@ -60,7 +60,7 @@ http {
 	set_real_ip_from 172.16.0.0/12; # Includes Docker subnet
 	set_real_ip_from 192.168.0.0/16;
 	# NPM generated CDN ip ranges:
-	include conf.d/include/ip_ranges.conf;
+	include conf.d/include/ipranges.conf;
 	# always put the following 2 lines after ip subnets:
 	real_ip_header X-Real-IP;
 	real_ip_recursive on;