tests: update tests, use blockchain test "network" field

Blockchain tests now include the "network" which determines the chain
config to use. Remove config matching based on test name and share the
name-to-config index with state tests.

Byzantium/Constantinople tests are still skipped because most of them
fail anyway.

tests/block_test_util.go

@@ -53,6 +53,7 @@ type btJSON struct {
 	Pre       core.GenesisAlloc     `json:"pre"`
 	Post      core.GenesisAlloc     `json:"postState"`
 	BestBlock common.UnprefixedHash `json:"lastblockhash"`
+	Network   string                `json:"network"`
 }
 
 type btBlock struct {
@@ -91,7 +92,12 @@ type btHeaderMarshaling struct {
 	Timestamp  *math.HexOrDecimal256
 }
 
-func (t *BlockTest) Run(config *params.ChainConfig) error {
+func (t *BlockTest) Run() error {
+	config, ok := Forks[t.json.Network]
+	if !ok {
+		return UnsupportedForkError{t.json.Network}
+	}
+
 	// import pre accounts & construct test genesis block & state root
 	db, _ := ethdb.NewMemDatabase()
 	gblock, err := t.genesis(config).Commit(db)