Update OpenWrt packages repo to 14.07

The only packages we use from this repo are haveged and (now) fastd and its
dependencies, so we can make the switch safely without updating OpenWrt itself
to Barrier Breaker yet.
Update routing repo to 14.07

This gets us an up-to-date alfred (and batman-adv 2014.x, as soon as we start to
support it).
Switch to "official" LuCi git mirror on git.openwrt.org and update to current master