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/client/client.rs

@@ -1153,7 +1153,8 @@ impl Client {
 			},
 		};
 
-		snapshot::take_snapshot(&*self.engine, &self.chain.read(), start_hash, db.as_hashdb(), writer, p)?;
+		let processing_threads = self.config.snapshot.processing_threads;
+		snapshot::take_snapshot(&*self.engine, &self.chain.read(), start_hash, db.as_hashdb(), writer, p, processing_threads)?;
 
 		Ok(())
 	}

ethcore/src/client/config.rs

@@ -19,6 +19,7 @@ use std::fmt::{Display, Formatter, Error as FmtError};
 
 use verification::{VerifierType, QueueConfig};
 use journaldb;
+use snapshot::SnapshotConfiguration;
 
 pub use std::time::Duration;
 pub use blockchain::Config as BlockChainConfig;
@@ -120,6 +121,8 @@ pub struct ClientConfig {
 	pub check_seal: bool,
 	/// Maximal number of transactions queued for verification in a separate thread.
 	pub transaction_verification_queue_size: usize,
+	/// Snapshot configuration
+	pub snapshot: SnapshotConfiguration,
 }
 
 impl Default for ClientConfig {
@@ -144,6 +147,7 @@ impl Default for ClientConfig {
 			history_mem: 32 * mb,
 			check_seal: true,
 			transaction_verification_queue_size: 8192,
+			snapshot: Default::default(),
 		}
 	}
 }