p2p/simulations: introduce dialBan

- Refactor simulations/network connection getters to support
  avoiding simultaneous dials between two peers If two peers dial
  simultaneously, the connection will be dropped to help avoid
  that, we essentially lock the connection object with a
  timestamp which serves as a ban on dialing for a period of time
  (dialBanTimeout).

- The connection getter InitConn can be wrapped and passed to the
  nodes via adapters.NodeConfig#Reachable field and then used by
  the respective services when they initiate connections. This
  massively stablise the emerging connectivity when running with
  hundreds of nodes bootstrapping a network.

p2p: add Inbound public method to p2p.Peer

p2p/simulations: Add server id to logs to support debugging
in-memory network simulations when multiple peers are logging.

p2p: SetupConn now returns error. The dialer checks the error and
only calls resolve if the actual TCP dial fails.

common: fix hex utils to handle 1 byte address conversions

* core/vm: track 63/64 call gas off stack

Gas calculations in gasCall* relayed the available gas for calls by
replacing it on the stack. This lead to inconsistent traces, which we
papered over by copying the pre-execution stack in trace mode.

This change relays available gas using a temporary variable, off the
stack, and allows removing the weird copy.

* core/vm: remove stackCopy

* core/vm: pop call gas into pool

* core/vm: to -> addr

cmd/utils: bootstrap nodes in config file were not respected

* trie: make fullnode children hash calculation concurrently

* trie: thread out only on topmost fullnode

* trie: clean up full node children hash calculation

* trie: minor code fixups

Signed-off-by: Maximilian Meister <mmeister@suse.de>

* Disallow --lightserv in light mode

* Reformatted

* cmd/utils: reduce nesting levels a bit

core/state: copy trie too, not just content

swarm/api: bug fix exact match for manifest

accounts/keystore: change modtime for test case files to be bigger than 1sec.

* cmd, consensus, eth: split ethash related config to it own

* eth, consensus: minor polish

* eth, consenus, console: compress pow testing config field to single one

* consensus, eth: document pow mode

internal/ethapi: avoid recreating JavaScript tracer wrappers

* console: fix typo in comment

* contracts/release: fix typo in comment

* core: fix typo in comment

* eth: fix typo in comment

* miner: fix typo in comment

* cmd: fix typo in comment

* cmd/puppeth: tiny comment fixup

cmd/puppeth: new version as presented at devcon3

build: fix typo in comment

les: clean up tx journal file after testing