Merge branch 'predictable-interface-names'

This imports the wiki page for predictable interface names. I think it's
useful to preserve history here because it's a contentious subject, and
it's useful to know when what happened.

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 +# systemd Documentation
 +
 +* [Automatic Boot Assessment](https://systemd.io/AUTOMATIC_BOOT_ASSESSMENT)
 +* [Locking Block Device Access](https://systemd.io/BLOCK_DEVICE_LOCKING)
 +* [The Boot Loader Interface](https://systemd.io/BOOT_LOADER_INTERFACE)
 +* [The Boot Loader Specification](https://systemd.io/BOOT_LOADER_SPECIFICATION)
 +* [Control Group APIs and Delegation](https://systemd.io/CGROUP_DELEGATION)
 +* [The systemd Community Conduct Guidelines](https://github.com/systemd/systemd/blob/master/docs/CODE_OF_CONDUCT.md)
 +* [Code Quality Tools](https://systemd.io/CODE_QUALITY)
 +* [Coding Style](https://systemd.io/CODING_STYLE)
 +* [Contributing](https://github.com/systemd/systemd/blob/master/docs/CONTRIBUTING.md)
 +* [Porting systemd To New Distributions](https://systemd.io/DISTRO_PORTING)
++* [Predictable Network Interface Names](https://systemd.io/PREDICTABLE_INTERFACE_NAMES)
 +* [Known Environment Variables](https://systemd.io/ENVIRONMENT)
 +* [Hacking on systemd](https://systemd.io/HACKING)
 +* [Portable Services Introduction](https://systemd.io/PORTABLE_SERVICES)
 +* [Steps to a Successful Release](https://systemd.io/RELEASE)
 +* [What settings are currently available for transient units?](https://systemd.io/TRANSIENT-SETTINGS)
 +* [Notes for Translators](https://systemd.io/TRANSLATORS)
 +* [Users, Groups, UIDs and GIDs on `systemd` Systems](https://systemd.io/UIDS-GIDS)