This change allows you to specify multiple network interfaces to bridge
to, picking the first found.
```ruby
config.vm.network "public_network",
bridge: ["en4: Thunderbolt Ethernet",
"en6: Broadcom NetXtreme Gigabit Ethernet Controller",
"en0: Wi-Fi (AirPort)"]
```
Vagrant Core Plugins
These are plugins that ship with Vagrant. Vagrant core uses its own plugin system to power a lot of the core pieces that ship with Vagrant. Each plugin will have its own README which explains its specific role.