Punish offline validators, aura-style (#1216)

* make offline-reporting infrastructure more generic

* add a listener-trait for watching when the timestamp has been set

* prevent inclusion of empty offline reports

* add test for exclusion

* generate aura-offline reports

* ability to slash many times for being offline "multiple" times

* Logic for punishing validators for missing aura steps

* stub tests

* pave way for verification of timestamp vs slot

* alter aura import queue to wait for timestamp

* check timestamp matches seal

* do inherent check properly

* service compiles

* all tests compile

* test srml-aura logic

* aura tests pass

* everything builds

* some more final tweaks to block authorship for aura

* switch to manual delays before step

* restore substrate-consensus-aura to always std and address grumbles

* update some state roots in executor tests

* node-executor tests pass

* get most tests passing

* address grumbles

substrate/node/cli/Cargo.toml

@@ -12,7 +12,6 @@ futures = "0.1"
 exit-future = "0.1"
 substrate-cli = { path = "../../core/cli" }
 parity-codec = { version = "2.1" }
-parking_lot = "0.4"
 slog = "^2"
 sr-io = { path = "../../core/sr-io" }
 substrate-client = { path = "../../core/client" }
@@ -24,7 +23,6 @@ substrate-service = { path = "../../core/service" }
 substrate-transaction-pool = { path = "../../core/transaction-pool" }
 substrate-network = { path = "../../core/network" }
 substrate-consensus-aura = { path = "../../core/consensus/aura" }
-substrate-consensus-common = { path = "../../core/consensus/common" }
 substrate-finality-grandpa = { path = "../../core/finality-grandpa" }
 sr-primitives = { path = "../../core/sr-primitives" }
 node-executor = { path = "../executor" }