cmd/utils, node: create account manager in package node

The account manager was previously created by packge cmd/utils as part
of flag processing and then passed down into eth.Ethereum through its
config struct. Since we are starting to create nodes which do not have
eth.Ethereum as a registered service, the code was rearranged to
register the account manager as its own service. Making it a service is
ugly though and it doesn't really fix the root cause: creating nodes
without eth.Ethereum requires duplicating lots of code.

This commit splits utils.MakeSystemNode into three functions, making
creation of other node/service configurations easier. It also moves the
account manager into Node so it can be used by those configurations
without requiring package eth.

console/console_test.go

@@ -23,12 +23,10 @@ import (
 	"io/ioutil"
 	"math/big"
 	"os"
-	"path/filepath"
 	"strings"
 	"testing"
 	"time"
 
-	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/eth"
@@ -92,18 +90,16 @@ func newTester(t *testing.T, confOverride func(*eth.Config)) *tester {
 	if err != nil {
 		t.Fatalf("failed to create temporary keystore: %v", err)
 	}
-	accman := accounts.NewPlaintextManager(filepath.Join(workspace, "keystore"))
 
 	// Create a networkless protocol stack and start an Ethereum service within
-	stack, err := node.New(&node.Config{DataDir: workspace, Name: testInstance, NoDiscovery: true})
+	stack, err := node.New(&node.Config{DataDir: workspace, UseLightweightKDF: true, Name: testInstance, NoDiscovery: true})
 	if err != nil {
 		t.Fatalf("failed to create node: %v", err)
 	}
 	ethConf := &eth.Config{
-		ChainConfig:    &core.ChainConfig{HomesteadBlock: new(big.Int)},
-		Etherbase:      common.HexToAddress(testAddress),
-		AccountManager: accman,
-		PowTest:        true,
+		ChainConfig: &core.ChainConfig{HomesteadBlock: new(big.Int)},
+		Etherbase:   common.HexToAddress(testAddress),
+		PowTest:     true,
 	}
 	if confOverride != nil {
 		confOverride(ethConf)