cmd/geth: set correct initial nonce on testnet for import/init subcommands (#2924)

cmd/geth/chaincmd.go

@@ -76,6 +76,9 @@ func importChain(ctx *cli.Context) error {
 	if len(ctx.Args()) != 1 {
 		utils.Fatalf("This command requires an argument.")
 	}
+	if ctx.GlobalBool(utils.TestNetFlag.Name) {
+		state.StartingNonce = 1048576 // (2**20)
+	}
 	chain, chainDb := utils.MakeChain(ctx)
 	start := time.Now()
 	err := utils.ImportChain(chain, ctx.Args().First())