beta 2.5.1 (#10643)

* version: bump beta to 2.5.1

* fix(whisper expiry): current time + work + ttl (#10587)

* update bootnodes (#10595)

* config: update goerli bootnodes

* config: update kotti bootnodes

* adds rpc error message for --no-ancient-blocks (#10608)

* adds error message for --no-ancient-blocks, closes #10261

* Apply suggestions from code review

Co-Authored-By: seunlanlege <seunlanlege@gmail.com>

* Constantinople HF on POA Core (#10606)

* Constantinople HF on POA Core

Plan Constantinople/St.Petersfork HF on POA Core network at block 8582254.
Original PR in POA repository: https://github.com/poanetwork/poa-chain-spec/pull/110

* Remove extra empty line

* evm: add some mulmod benches (#10600)

* evm: add blockhash_mulmod bench

* evm: use num-bigint for mod ops

* Clique: zero-fill extradata when the supplied value is less than 32 bytes in length (#10605)

* Update kovan.json to switch validator set to POA Consensus Contracts (#10628)

* Fix publish docs (#10635)

* Fix publish docs

* this never should be forced, either way compiling previous versions will produce outdated docs

* fix array, var was moved to the group project global variables list

* Fix rinkeby petersburg fork (#10632)

ethcore/src/engines/clique/mod.rs

@@ -67,6 +67,7 @@ use std::time;
 use std::time::{Duration, SystemTime, UNIX_EPOCH};
 
 use block::ExecutedBlock;
+use bytes::Bytes;
 use client::{BlockId, EngineClient};
 use engines::clique::util::{extract_signers, recover_creator};
 use engines::{Engine, EngineError, Seal};
@@ -713,6 +714,13 @@ impl Engine<EthereumMachine> for Clique {
 						header.set_difficulty(DIFF_NOTURN);
 					}
 				}
+
+				let zero_padding_len = VANITY_LENGTH - header.extra_data().len();
+				if zero_padding_len > 0 {
+					let mut resized_extra_data = header.extra_data().clone();
+					resized_extra_data.resize(VANITY_LENGTH, 0);
+					header.set_extra_data(resized_extra_data);
+				}
 			} else {
 				trace!(target: "engine", "populate_from_parent: no signer registered");
 			}