Merge pull request #3696 from karalabe/contextual-logger

accounts/abi/bind/util.go

accounts/keystore/account_cache.go

accounts/keystore/watch.go

accounts/usbwallet/ledger_hub.go

accounts/usbwallet/ledger_wallet.go

build/update-license.go

cmd/bootnode/main.go

cmd/ethtest/main.go

cmd/evm/main.go

cmd/geth/accountcmd.go

cmd/geth/accountcmd_test.go

cmd/geth/chaincmd.go

cmd/geth/main.go

cmd/gethrpctest/main.go

cmd/swarm/main.go

cmd/swarm/manifest.go

cmd/swarm/upload.go

cmd/utils/cmd.go

cmd/utils/flags.go

cmd/wnode/main.go