tests: update tests and implement general state tests (#14734)

Tests are now included as a submodule. This should make updating easier
and removes ~60MB of JSON data from the working copy.

State tests are replaced by General State Tests, which run the same test
with multiple fork configurations.

With the new test runner, consensus tests are run as subtests by walking
json files. Many hex issues have been fixed upstream since the last
update and most custom parsing code is replaced by existing JSON hex
types. Tests can now be marked as 'expected failures', ensuring that
fixes for those tests will trigger an update to test configuration. The
new test runner also supports parallel execution and the -short flag.

tests/rlp_test_util.go

@@ -21,9 +21,7 @@ import (
 	"encoding/hex"
 	"errors"
 	"fmt"
-	"io"
 	"math/big"
-	"os"
 	"strings"
 
 	"github.com/ethereum/go-ethereum/rlp"
@@ -44,33 +42,6 @@ type RLPTest struct {
 	Out string
 }
 
-// RunRLPTest runs the tests in the given file, skipping tests by name.
-func RunRLPTest(file string, skip []string) error {
-	f, err := os.Open(file)
-	if err != nil {
-		return err
-	}
-	defer f.Close()
-	return RunRLPTestWithReader(f, skip)
-}
-
-// RunRLPTest runs the tests encoded in r, skipping tests by name.
-func RunRLPTestWithReader(r io.Reader, skip []string) error {
-	var tests map[string]*RLPTest
-	if err := readJson(r, &tests); err != nil {
-		return err
-	}
-	for _, s := range skip {
-		delete(tests, s)
-	}
-	for name, test := range tests {
-		if err := test.Run(); err != nil {
-			return fmt.Errorf("test %q failed: %v", name, err)
-		}
-	}
-	return nil
-}
-
 // Run executes the test.
 func (t *RLPTest) Run() error {
 	outb, err := hex.DecodeString(t.Out)