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* Permit concurrent dialing attempts per peer. This is a follow-up to https://github.com/libp2p/rust-libp2p/pull/1440 and relates to https://github.com/libp2p/rust-libp2p/issues/925. This change permits multiple dialing attempts per peer. Note though that `libp2p-swarm` does not yet make use of this ability, retaining the current behaviour. The essence of the changes are that the `Peer` API now provides `Peer::dial()`, i.e. regardless of the state in which the peer is. A dialing attempt is always made up of one or more addresses tried sequentially, as before, but now there can be multiple dialing attempts per peer. A configurable per-peer limit for outgoing connections and thus concurrent dialing attempts is also included. * Introduce `DialError` in `libp2p-swarm`. For a cleaner API and to treat the case of no addresses for a peer as an error, such that a `NetworkBehaviourAction::DialPeer` request is always matched up with either `inject_connection_established` or `inject_dial_error`. * Fix rustdoc link. * Add `DialPeerCondition::Always`. * Adapt to master. * Update changelog.