Query IP Address by CIDR

## What?

Today to search CIDR subnet 10.0.0.0/8 I need to do 10.* in query search. This was simple, but others subnet it is so much more complicated.

## Why?

If I want to query RFC1918 what I need to do?
(10.* OR 192.168.* OR 172.16.* OR 172.17.* OR 172.18.* OR 172.19.* OR 172.20.* OR 172.21.* OR 172.22.* OR 172.23.* OR 172.24.* OR 172.25.* OR 172.26.* OR 172.27.* OR 172.28.* OR 172.29.* OR 172.30.* OR 172.31.*)

With CIDR search what I need to do?
(10.0.0.0/8 OR 192.168.0.0/16 OR 172.16.0.0/12)

## Your Environment

* Graylog Version: 3.3.5
* Elasticsearch Version: 6.8.7
* MongoDB Version: 4.2
* Operating System: FreeBSD 12.1