[release/1.4.6] eth: enable bad block reports

We used to have reporting of bad blocks, but it was disabled
before the Frontier release. We need it back because users
are usually unable to provide the full RLP data of a bad
block when it occurs.

A shortcoming of this particular implementation is that the
origin peer is not tracked for blocks received during eth/63
sync. No origin peer info is still better than no report at
all though.

(cherry picked from commit ca18202eb9)

tests/init.go

@@ -25,8 +25,6 @@ import (
 	"net/http"
 	"os"
 	"path/filepath"
-
-	"github.com/ethereum/go-ethereum/core"
 )
 
 var (
@@ -59,11 +57,6 @@ var (
 	VmSkipTests    = []string{}
 )
 
-// Disable reporting bad blocks for the tests
-func init() {
-	core.DisableBadBlockReporting = true
-}
-
 func readJson(reader io.Reader, value interface{}) error {
 	data, err := ioutil.ReadAll(reader)
 	if err != nil {