* Update to latest ethereum reference tests to pull and enable a bunch of Constantinople tests they fix.
* Blacklist test that consumes a huge amount of memory on Constantinople as well.
* Upgrade ethereum reference tests
* Add support for sealEngine: NoProof by skipping PoW validation for ommer headers as well. Production code continues to always use full validation for ommers.
* Add Constantinople to reference test schedules ready for when we enable Constantinople tests.
* Blacklist the new reference tests that are failing while we investigate them.
On the transition to the EthHash/Clique Mining Coordinator a change
was lost whereby the EthHashMiningCoordinator is to capture the
current Hashrate on cancellation of a mining operation.
* [NC-1685] Fix BlockHashOperation so it handles blocks being added on forks and gets the hash of the block at the requested number on that fork rather than on the current canonical chain.
* [NC-1644] Cache block hashes across all transactions in a block.
The MiningCoordinator has been split into common, and ethhash
specific funcationality.
This adversely affects the JSON RPC, in that all mining related
RPCs are now generic based on the type of miner being used.
The EthHashMinerExecutor is comprised of both EthHash specific
functions as well as common functions which will be useful to other
consensus mechanisms.
As such the common functionality has been extracted to a parent class,
leaving ethhash specific functionality in the child.
Responsible for mining a block if the local node address
is a validator, and has not recently mined a block.
This has necessitated a slight rework of helper functions,
and shuffling of tests.
The EthHashBlockMiner contains both the generic mining capabilities
and the EthHash JSON specific API.
The generic capabilities have been extracted into a base class which
can be reused for Clique (or other) consensus mechanisms.