Gives us per-transport peers counts:

	ipfs_p2p_peers_total{transport="/ip4/tcp"} 25
	ipfs_p2p_peers_total{transport="/ip6/tcp"} 13
	ipfs_p2p_peers_total{transport="/ip6/udp/utp"} 17

License: MIT
Signed-off-by: Lars Gierth <larsg@systemli.org>