fix(network): Rename and match globally.

Instead of trying to limit this to physical interfaces just match
globally and prefix the file with 99 the match order with other .network
files is easily managed. To avoid matching things like docker0 the
docker ebuild will need to provide its own .network files.
fix(tmpfiles): Remove duplicate and unnecessary rules

Some of these rules are either now in baselayout or were left over from
ChromeOS and we never really needed them in the first place.
Merge pull request #55 from marineam/network

networkd default config