Add custom .conf above includes for NPM-generated files.

Added a new clause for custom http_top.conf above the include clauses for NPM-generated files. Allows for more flexibility with adding custom nginx .conf files to NPM

Use case: adding a configuration change needs to be present before other custom configuration files are called and reference configuration from the custom http_top.conf file.
Example: add a new log_format in http_top.conf, then referencing it in a access_log clause in server_proxy.conf.

docker/rootfs/etc/nginx/nginx.conf

@@ -69,6 +69,9 @@ http {
 	real_ip_header X-Real-IP;
 	real_ip_recursive on;
 
+	# Custom
+	include /data/nginx/custom/http_top[.]conf;
+
 	# Files generated by NPM
 	include /etc/nginx/conf.d/*.conf;
 	include /data/nginx/default_host/*.conf;