This PR fixes multiple issues with the UDP connection pre-negotiation feature:
- the enable condition was wrong (it checked the existence of the DiscV5 struct where it wasn't initialized yet, disabling the feature even if discv5 was enabled)
- the server pool queried already connected nodes when the discovery iterators returned them again
- servers responded positively before they were synced and really willing to accept connections

Metrics are also added on the server side that count the positive and negative replies to served connection queries.

This PR fixes multiple issues with the UDP connection pre-negotiation feature:

- the enable condition was wrong (it checked the existence of the DiscV5 struct where it wasn't initialized yet, disabling the feature even if discv5 was enabled)
- the server pool queried already connected nodes when the discovery iterators returned them again
- servers responded positively before they were synced and really willing to accept connections

Metrics are also added on the server side that count the positive and negative replies to served connection queries.

* core/rawdb: more verbose error logs + better hashing

* core/rawdb: add failing testcase

* core/rawdb: properly hash transactions while indexing/unindexing

* core/rawdb: exit on error + better log msg

Flatten the image so we do not have dark text on dark background

Responding to these comments:

    https://github.com/ethereum/go-ethereum/pull/21502/files#r579010962
    https://github.com/ethereum/go-ethereum/pull/21502/files#r579021565
    https://github.com/ethereum/go-ethereum/pull/21502/files#r579023510
    https://github.com/ethereum/go-ethereum/pull/21502/files#r578983734

The oss-fuzz fuzzer has been reporting some failing testcases for les. They're all spurious, and cannot reliably be reproduced. However, running them showed that there was a goroutine leak: the tests created a lot of new clients, which started an exec queue that was never torn down.

This PR fixes the goroutine leak, and also a log message which was erroneously formatted.

* cmd/geth: remove copydb command

* eth/downloader: remove fakepeer

* eth/state, les/state: properly init statedb accesslist when tracing, fixes #22475

* eth: review comments

* eth/tracers: fix compilation err

* eth/tracers: apply @karalabe's suggested fix

Given a list of less than two elements DecodeRLP returned rlp.EOL,
leading to issues in outer decoders.

* les: add trailing slash to metric namespace

* les: omit '.' in metric namespace

tests: update reference tests with 2315 removed from Berlin

Revert "core/forkid, params: unset Berlin fork number"

core, eth: unship EIP 2315

build: add support for Ubuntu Hirsute Hippo

build: fix PPA failure due to updated debsrc

This reverts commit ba999105.

This updates the consensus tests to commit 31d6630 and
adds support for access list transactions in the test runner.

Co-authored-by: Martin Holst Swende <martin@swende.se>

* cmd: retire whisper flags

* cmd/geth: remove whisper configs

* cmd/utils: fix exclusive check for archive node

* cmd/utils: set the txlookuplimit to 0