remove v1 and v2 blocksync protocol impementations (#9146)

config/config.go

@@ -897,10 +897,8 @@ func (cfg *FastSyncConfig) ValidateBasic() error {
 	switch cfg.Version {
 	case "v0":
 		return nil
-	case "v1":
-		return nil
-	case "v2":
-		return nil
+	case "v1", "v2":
+		return fmt.Errorf("fast sync version %s has been deprecated. Please use v0 instead", cfg.Version)
 	default:
 		return fmt.Errorf("unknown fastsync version %s", cfg.Version)
 	}

config/config_test.go

@@ -134,7 +134,7 @@ func TestFastSyncConfigValidateBasic(t *testing.T) {
 
 	// tamper with version
 	cfg.Version = "v1"
-	assert.NoError(t, cfg.ValidateBasic())
+	assert.Error(t, cfg.ValidateBasic())
 
 	cfg.Version = "invalid"
 	assert.Error(t, cfg.ValidateBasic())

config/toml.go

@@ -434,9 +434,11 @@ chunk_fetchers = "{{ .StateSync.ChunkFetchers }}"
 [fastsync]
 
 # Fast Sync version to use:
-#   1) "v0" (default) - the legacy fast sync implementation
-#   2) "v1" - refactor of v0 version for better testability
-#   2) "v2" - complete redesign of v0, optimized for testability & readability
+# 
+# In v0.37, v1 and v2 of the fast sync protocol were deprecated.
+# Please use v0 instead.
+#
+#   1) "v0" - the default fast sync implementation
 version = "{{ .FastSync.Version }}"
 
 #######################################################