peer+lnd: fix peer blocking on node shutdown

[yyforyongyu]

Cherry-picked commits from the final blockbeat to reduce the PR size.

This commit fixes a case where the peer blocks the shutdown process. During the shutdown, the server will call s.DisconnectPeer, which calls peer.Disconnect. Because the peer never enters peer.Start via s.peerInitializer, the startReady chan will not be closed, causing peer.Disconnect to hang forever. We now fix it by only block on startReady when the peer is started.

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[guggero]

Nice catch! Just one comment about the added logging statement.

[guggero]

Thanks for the clarifying comments 🙏 LGTM 🎉

[Roasbeef]

LGTM 🗾