[Login] Service might fail on installations with static IP

[asciidisco]

If an OS that boots Kodi on startup is used & a static IP is given, it might be the case that the service fails on startup & the plugin can't be started.
This happens because we "ask" the OS on startup to assign two ports for our two internal service webservers.
Getting the port sock.getsockname() is the weak spot here (see https://github.com/asciidisco/plugin.video.netflix/blob/master/service.py#L18), as it throws if the network isn't up at the point of excecution of that piece of code.