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Wladimir J. van der Laan 7f609f68d8 Merge #19731 : net, rpc: expose nLastBlockTime/nLastTXTime as last block/last_transaction in getpeerinfo

5da96210fc doc: release note for getpeerinfo last_block/last_transaction (Jon Atack)
cfef5a2c98 test: rpc_net.py logging and test naming improvements (Jon Atack)
21c57bacda test: getpeerinfo last_block and last_transaction tests (Jon Atack)
8a560a7d57 rpc: expose nLastBlockTime/TXTime as getpeerinfo last_block/transaction (Jon Atack)
02fbe3ae0b net: add nLastBlockTime/TXTime to CNodeStats, CNode::copyStats (Jon Atack)

Pull request description:

  This PR adds inbound peer eviction criteria `nLastBlockTime` and `nLastTXTime` to `CNodeStats` and `CNode::copyStats`, which then allows exposing them in the next commit as `last_transaction` and `last_block` Unix Epoch Time fields in RPC `getpeerinfo`.

  This may be useful for writing missing eviction tests. I'd also like to add `lasttx` and `lastblk` columns to the `-netinfo` dashboard as described in https://github.com/bitcoin/bitcoin/pull/19643#issuecomment-671093420.

  Relevant discussion at the p2p irc meeting http://www.erisian.com.au/bitcoin-core-dev/log-2020-08-11.html#l-549:
  ```text
  <jonatack> i was specifically trying to observe and figure out how to test https://github.com/bitcoin/bitcoin/issues/19500
  <jonatack> which made me realise that i didn't know what was going on with my peer conns in enough detail
  <jonatack> i'm running bitcoin locally with nLastBlockTime and nLastTXTime added to getpeerinfo for my peer connections dashboard
  <jonatack> sipa: is there a good reason why that (eviction criteria) data is not exposed through getpeerinfo currently?
  <sipa> jonatack: nope; i suspect just nobody ever added it
  <jonatack> sipa: thanks. will propose.
  ```

  The last commit is optional, but I think it would be good to have logging in `rpc_net.py`.

ACKs for top commit:
  jnewbery:
    Code review ACK 5da96210fc
  theStack:
    Code Review ACK 5da96210fc
  darosior:
    ACK 5da96210fc

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