Fix byte order handling in network helper

Network helper isn't consistent in using the host or network byte order when dealing with IP addresses. This is a fix that changes all data in memory to host byte order.

The problem that drew my attention to this was that while playing a video on youtube, I could see no download rate in the system monitor on the process. The reason was that youtube used ipv6 as its protocol and ipv6 was particularly affected by the endianness problem. In my view, it's clearer to use host endian wherever possible, even if network byte order would usually do as well if applied consistently.

Please, check if you can cherry-pick this to master as well.