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

build: drop yakkety builds (launchpad end of life)

node: fix doc typo

cmd/puppeth: remove wrapping loop in single reads

Makefile: call shell function to get pwd

cmd: add makecache cmd, use caches during import cmd

There is currently no simple way to obtain the network ID from a Client. 
This adds a NetworkID method that wraps the net_version JSON-RPC call.

Previously, NewManifest was asynchronous so subsequent code which tried
to use the returned manifest could error as the manifest was not yet
persisted.

This patch updates the Address type in common/types.go so that the Hex
function provides an EIP55-compliant output string. The implementation is pretty lightweight; 
on my laptop the benchmark gives 1100ns/op, with the majority of that value due to the Keccak hash.

mobile: add RinkebyGenesis method

* core: reduce txpool event loop goroutines and sync structs

* cmd, core, eth: journal local transactions to disk

* core: journal replacement pending transactions too

* core: separate transaction journal from pool

trie: typo in comment

core/vm/runtime: fix evm command to use --gasprice flag value