Re-establish connections on primary interface

#### Version information:

go-ipfs version: 0.4.14-dev-2140aa957
Repo version: 6
System version: amd64/darwin
Golang version: go1.9.2

#### Type:

Enhancement

#### Description:

Machines that are connected through Wi-Fi don't reconnect over e.g. Ethernet when that connection type is present. The ipfs daemon will re-connect if it looses connection, but does not opportunistically use a better local connection option (e.g. Ethernet). This is a problem where machines are constantly join and leave Ethernet because connections will migration to the wireless interface on disconnection of Ethernet, but won't migrate back.