The upgrade to multiaddr 7 brings with it a change that means multiaddrs with libp2p peer ID keys like `/ipfs/QmXXX` will be transformed to `/p
2p/QmXXX` when converted from a string, to a multiaddr instance and back to a string.
This is because `p2p` and `ipfs` are name aliases for the same codec. `p2p` has now become the default and older `ipfs` names do not round trip(they are converted to `p2p` - as stated above).
This change allows us to use the new multiaddr 7 lib but retain backward compatibility by ensuring the protocol specified in a string multiaddr is the protocol used in the resulting URI.
