tests: update tests, use blockchain test "network" field

* core: Remove unused `state` parameter to `NewEnv`.

`cfg.State` is used instead.

* core/vm/runtime: remove unused import

Blockchain tests now include the "network" which determines the chain
config to use. Remove config matching based on test name and share the
name-to-config index with state tests.

Byzantium/Constantinople tests are still skipped because most of them
fail anyway.

* eth/downloader: fix race in downloadTesterPeer
Signed-off-by: Ivan Daniluk <ivan.daniluk@gmail.com>

* eth/downloader: minor datarace fix cleanup

* contracts: fix megacheck errors

* contracts: drop useless sleep, lets see what breaks

* les: fix megacheck warnings

* les: fixed testGetProofs

* whisper: fix megacheck warnings

* whisper/whisperv5: regenerate json codec to fix unused override type

* crypto: fix megacheck warnings

* crypto/ecies: remove ASN.1 support

core: fix txpool journal and test races

* ethdb: add basic sanity test

* ethdb: test MemDatabase

* ethdb: add parallel tests

eth: fix megacheck warnings

internal/build: add GoTool and document why it uses GOROOT

core: fix blockchain goroutine leaks in tests

consensus: fix megacheck warnings

* cmd: fix megacheck warnings

* cmd: revert time.Until changes, keep readFloat

miner: fix megacheck warnings

node: fix megacheck warnings

ethstats: fix megacheck warnings

log: fix megacheck warnings

console: fix megacheck warnings

common: fix megacheck warnings

* accounts: fix megacheck warnings

* accounts: don't modify abi in favor of full cleanup

core: bump timeout test to avoid flakyness on overloaded ci