temporary diagnostics for peer investigation

[teor2345]

Motivation

This PR shows extra peer connection information in the getpeerinfo RPC and Zebra's logs.

It is just for investigating ticket #7787, these fields are not standard and should not be merged.

[teor2345]

This PR generates logs like:

2023-11-02T01:56:32.233521Z  INFO {zebrad="6858fd4" net="Main"}:add_initial_peers: zebra_network::peer_set::initialize: an initial peer connection failed successes=0 errors=1 addr=v6redacted:8233 e=Netwo
rk is unreachable (os error 101)                                                                                                                                                                           
2023-11-02T01:56:35.230658Z  INFO zebra_state::service::finalized_state::disk_format::upgrade: database format is valid running_version=25.3.0 inital_disk_version=25.3.0                                  
2023-11-02T01:56:35.834470Z  INFO {zebrad="6858fd4" net="Main"}:add_initial_peers: zebra_network::peer_set::initialize: an initial peer connection failed successes=22 errors=2 addr=v4redacted:8233 e=requ
est timed out

And RPC responses like:

$ zcash-cli -rpcport=28232 getpeerinfo
  {
    "addr": "IPv6:8233",
    "state": "NeverAttemptedGossiped",
    "remote_last_seen": "None",
    "last_response": "None",
    "last_failed": "None"
  },
  {
    "addr": "IPv6:8233",
    "state": "NeverAttemptedGossiped",
    "remote_last_seen": "None",
    "last_response": "None",
    "last_failed": "None"
  },
  {
    "addr": "IPv6:8233",
    "state": "NeverAttemptedGossiped",
    "remote_last_seen": "None",
    "last_response": "None",
    "last_failed": "None"
  },
  {
    "addr": "IPv6:8233",
    "state": "NeverAttemptedAlternate",
    "remote_last_seen": "None",
    "last_response": "None",
    "last_failed": "None"
  },
  {
    "addr": "IPv6:8233",
    "state": "NeverAttemptedAlternate",
    "remote_last_seen": "None",
    "last_response": "None",
    "last_failed": "None"
  }

[teor2345]

IP addresses are redacted in the logs, that is implemented here:
https://github.com/ZcashFoundation/zebra/blob/main/zebra-network/src/meta_addr/peer_addr.rs

[teor2345]

I added the last version message (and connection version) to the getpeerinfo RPC. This should tell us what user_agent those peers have, if they send a Bitcoin Version message.

[teor2345]

Now the output looks like:

 {
    "addr": "IPv4:8233",
    "state": "Failed",
    "negotiated_version": "Version(170100)",
    "last_version_message": "VersionMessage { version: Version(170100), services: PeerServices(NODE_NETWORK), timestamp: 2023-11-03T05:14:36Z, address_recv: AddrInVersion { untrusted_services: PeerServices(NODE_NETWORK), addr: DifferentIPv4:31708 }, address_from: AddrInVersion { untrusted_services: PeerServices(NODE_NETWORK), addr: 0.0.0.0:8233 }, nonce: Nonce(2083055191835223851), user_agent: \"/MagicBean:5.7.0/\", start_height: Height(2283660), relay: true }",
    "last_response": "DateTime32 { timestamp: 1698989303, calendar: 2023-11-03T05:28:23Z }",
    "last_failure": "Instant { tv_sec: 19722863, tv_nsec: 288455831 }"
  },
  {
    "addr": "IPv4:8233",
    "state": "Failed",
    "negotiated_version": "Version(170100)",
    "last_version_message": "VersionMessage { version: Version(170100), services: PeerServices(NODE_NETWORK), timestamp: 2023-11-03T05:14:37Z, address_recv: AddrInVersion { untrusted_services: PeerServices(NODE_NETWORK), addr: DifferentIPv4:31532 }, address_from: AddrInVersion { untrusted_services: PeerServices(NODE_NETWORK), addr: 0.0.0.0:8233 }, nonce: Nonce(18138978616707281022), user_agent: \"/MagicBean:5.7.0/\", start_height: Height(2283660), relay: true }",
    "last_response": "DateTime32 { timestamp: 1698989304, calendar: 2023-11-03T05:28:24Z }",
    "last_failure": "Instant { tv_sec: 19722863, tv_nsec: 923423357 }"
  },
  {
    "addr": "[IPv6]:8233",
    "state": "Failed",
    "remote_last_seen": "DateTime32 { timestamp: 1698988478, calendar: 2023-11-03T05:14:38Z }",
    "last_failure": "Instant { tv_sec: 19721980, tv_nsec: 176347278 }"
  },
  {
    "addr": "IPv4:8233",
    "state": "Failed",
    "remote_last_seen": "DateTime32 { timestamp: 1698987600, calendar: 2023-11-03T05:00:00Z }",
    "last_failure": "Instant { tv_sec: 19722224, tv_nsec: 702493361 }"
  },
  {
    "addr": "IPv4:8233",
    "state": "Failed",
    "remote_last_seen": "DateTime32 { timestamp: 1698987600, calendar: 2023-11-03T05:00:00Z }",
    "last_failure": "Instant { tv_sec: 19722227, tv_nsec: 704088569 }"
  },
  {
    "addr": "IPv4:8233",
    "state": "Failed",
    "remote_last_seen": "DateTime32 { timestamp: 1698987600, calendar: 2023-11-03T05:00:00Z }",
    "last_failure": "Instant { tv_sec: 19722654, tv_nsec: 178262353 }"
  },
  {
    "addr": "IPv4:8233",
    "state": "Failed",
    "negotiated_version": "Version(170100)",
    "last_version_message": "VersionMessage { version: Version(170100), services: PeerServices(NODE_NETWORK), timestamp: 2023-11-03T05:25:00Z, address_recv: AddrInVersion { untrusted_services: PeerServices(NODE_NETWORK), addr: DifferentIPv4:31626 }, address_from: AddrInVersion { untrusted_services: PeerServices(NODE_NETWORK), addr: 0.0.0.0:8233 }, nonce: Nonce(15080595378646283320), user_agent: \"/Zebra:1.3.0/\", start_height: Height(2283675), relay: true }",
    "last_response": "DateTime32 { timestamp: 1698989214, calendar: 2023-11-03T05:26:54Z }",
    "last_failure": "Instant { tv_sec: 19722775, tv_nsec: 27109102 }"
  }
]

[teor2345]

This PR has served its purpose.