Backports for 2.0.5 stable (#9519)

* parity-version: mark 2.0.5 track stable

* deps: bump fs-swap to 0.2.4

* Remove initial token for WS. (#9545)

* version: mark release critical

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

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

+ Gas-cap increased to 10M by default

* 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

parity/cli/tests/config.full.toml

@@ -125,14 +125,14 @@ min_gas_price = 0
 usd_per_tx = "0.0001"
 usd_per_eth = "auto"
 price_update_period = "hourly"
-gas_floor_target = "4700000"
-gas_cap = "6283184"
+gas_floor_target = "8000000"
+gas_cap = "10000000"
 tx_queue_size = 8192
 tx_queue_gas = "off"
 tx_queue_strategy = "gas_factor"
 tx_queue_ban_count = 1
 tx_queue_ban_time = 180 #s
-tx_gas_limit = "6283184"
+tx_gas_limit = "10000000"
 tx_time_limit = 100 #ms
 tx_queue_no_unfamiliar_locals = false
 extra_data = "Parity"