go-ipfs dials out of addresses that are not in Addresses.Swarm

#### Version information:
go-ipfs version: 0.4.10-
Repo version: 5
System version: amd64/linux
Golang version: go1.8.3

#### Type:
Bug

#### Severity:
Medium

#### Description:

go-ipfs should only dial out of addresses that are used in `Addresses.Swarm`.

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Old description:
While you can configure on which addresses `Swarm` listens, `ipfs daemon` uses *all* available addresses/devices to connect to other peers. It would be great to be able to restrict the use to certain devices (network interfaces) only, e.g. `tun0`.

This is especially helpful if you want to setup a *cjdns-only node*, which only connects via the cjdns network (tun0). (https://github.com/cjdelisle/cjdns)