Backports for 2.1.0 beta (#9518)

* parity-version: mark 2.1.0 track beta

* ci: update branch version references

* docker: release master to latest

* Fix checkpointing when creating contract failed (#9514)

* ci: fix json docs generation (#9515)

* fix typo in version string (#9516)

* Update patricia trie to 0.2.2 crates. Default dependencies on minor
version only.

* Putting back ethereum tests to the right commit

* Enable all Constantinople hard fork changes in constantinople_test.json (#9505)

* Enable all Constantinople hard fork changes in constantinople_test.json

* Address grumbles

* Remove EIP-210 activation

* 8m -> 5m

* Temporarily add back eip210 transition so we can get test passed

* Add eip210_test and remove eip210 transition from const_test

* In create memory calculation is the same for create2 because the additional parameter was popped before. (#9522)

* deps: bump fs-swap and kvdb-rocksdb

* Multithreaded snapshot creation (#9239)

* Add Progress to Snapshot Secondary chunks creation

* Use half of CPUs to multithread snapshot creation

* Use env var to define number of threads

* info to debug logs

* Add Snapshot threads as CLI option

* Randomize chunks per thread

* Remove randomness, add debugging

* Add warning

* Add tracing

* Use parity-common fix seek branch

* Fix log

* Fix tests

* Fix tests

* PR Grumbles

* PR Grumble II

* Update Cargo.lock

* PR Grumbles

* Default snapshot threads to half number of CPUs

* Fix default snapshot threads // min 1

* correct before_script for nightly build versions (#9543)

- fix gitlab array of strings syntax error
- get proper commit id
- avoid colon in stings

* Remove initial token for WS. (#9545)

* version: mark release critical

* ci: fix rpc docs generation 2 (#9550)

* Improve P2P discovery (#9526)

* Add `target` to Rust traces

* network-devp2p: Don't remove discovery peer in main sync

* network-p2p: Refresh discovery more often

* Update Peer discovery protocol

* Run discovery more often when not enough nodes connected

* Start the first discovery early

* Update fast discovery rate

* Fix tests

* Fix `ping` tests

* Fixing remote Node address ; adding PingPong round

* Fix tests: update new +1 PingPong round

* Increase slow Discovery rate
Check in flight FindNode before pings

* Add `deprecated` to deprecated_echo_hash

* Refactor `discovery_round` branching

* net_version caches network_id to avoid redundant aquire of sync read lock (#9544)

* net_version caches network_id to avoid redundant aquire of sync read lock, #8746

* use lower_hex display formatting for net_peerCount rpc method

* Increase Gas-floor-target and Gas Cap (#9564)

+ Gas-floor-target increased to 8M by default

+ Gas-cap increased to 10M by default

* Revert to old parity-tokio-ipc.

* Downgrade named pipes.

ethcore/src/tests/evm.rs

@@ -38,7 +38,7 @@ fn test_blockhash_eip210(factory: Factory) {
 	let test_blockhash_contract = "73fffffffffffffffffffffffffffffffffffffffe33141561007a57600143036020526000356101006020510755600061010060205107141561005057600035610100610100602051050761010001555b6000620100006020510714156100755760003561010062010000602051050761020001555b61014a565b4360003512151561009057600060405260206040f35b610100600035430312156100b357610100600035075460605260206060f3610149565b62010000600035430312156100d157600061010060003507146100d4565b60005b156100f6576101006101006000350507610100015460805260206080f3610148565b630100000060003543031215610116576000620100006000350714610119565b60005b1561013c57610100620100006000350507610200015460a052602060a0f3610147565b600060c052602060c0f35b5b5b5b5b";
 	let blockhash_contract_code = Arc::new(test_blockhash_contract.from_hex().unwrap());
 	let blockhash_contract_code_hash = keccak(blockhash_contract_code.as_ref());
-	let machine = ::ethereum::new_constantinople_test_machine();
+	let machine = ::ethereum::new_eip210_test_machine();
 	let mut env_info = EnvInfo::default();
 
 	// populate state with 256 last hashes