By providing the following items to `LDFLAGS`:
* `-X github.com/yggdrasil-network/yggdrasil-go/src/defaults.defaultConfig=/path/to/config`
* '-X github.com/yggdrasil-network/yggdrasil-go/src/defaults.defaultAdminListen=unix://path/to/sock'
Closes#818.
Specifying the full path to the interface in OpenBSD would result in:
panic: Interface name must be tun[0-9]*
Therefore, DefaultIfName should be changed to tun0 in order to make yggdrasil work out of the box.