consensus,core: shortcut uncle validation

params: set Rinkeby Petersburg fork block (4th May, 2019)

appveyor: Upgrade to go1.12.2

cmd: nuke geth bug, nobody is using it anyway

trie: there's no point in retrieving the metaroot

cmd/geth, internal, node, vendor: nuke geth monitor

* core/state: fix state iterator

* core: fix state iterator more elegant

core: re-emit new log event when logs rebirth

* node: switching prometheus flock location to tsdb

* rookie mistake

* cmd, accounts, internal, node, rpc, signer: insecure unlock protect

* all: strict unlock API by rpc

* cmd/geth: check before printing warning log

* accounts, cmd/geth, internal: tiny polishes

This PR makes it easy to generate and execute testcases for VM arithmetic operations. By enabling and running the testcase TestWriteExpectedValues, a set of json files are created which contain input and output for each arith operation.
The test TestJsonTestcases executes all of those tests.

While meaningless as is, this PR makes it less risky to make changes (optimizations) to the vm operations, since there will be a larger body of testcases.

* all: simplify timestamps to uint64

* tests: update definitions

* clef, faucet, mobile: leftover uint64 fixups

* ethash: fix tests

* graphql: update schema for timestamp

* ethash: remove unused variable

core: prefetch next block state concurrently

console: handle eth.coinbase throws

light, params: update CHTs, integrate CHT for Goerli too

Corrected error for ExitWhenSyncedFlag, clarifying that the program exits after syncing completes.

swarm/network:   hive bug: needed shallow peers are not sent to nodes beyond connection's proximity order (#19326)

* swarm/network: fix hive bug not sending shallow peers

-  hive bug: needed shallow peers were not sent to nodes beyond connection's proximity order
- add extensive protocol exchange tests for initial subPeersMsg-peersMsg exchange
- modify bzzProtocolTester to allow pregenerated overlay addresses

* swarm/network: attempt to fix hive persistance test

* swarm/network: fix TestHiveStatePersistance (#1320)

* swarm/network: remove trace lines from the hive persistance test

* address PR review comments

* swarm/network: address PR comments on TestInitialPeersMsg

 * eliminate *testing.T argument from bzz/hive protocoltesters
 * add sorting (only runs in test code) on peersMsg payload
 * add random (0 to MaxPeersPerPO) peers for each po
 * add extra peers closer to pivot than control

core/vm: Correct the Memory Gas Overflow condition