update chain-id format (#542)

* chain_id.go

* rpc changes

* update scripts

* additional test

* changelog

* fix tests

* update script

* rpc updates

* validate testnet command chain-id

* validate rest server chain-id

* fix lint

* rpc updates

* changelog

* comment simulations

cmd/ethermintcli/main.go

@@ -66,7 +66,9 @@ func main() {
 		sdkclient.ConfigCmd(app.DefaultCLIHome),
 		queryCmd(cdc),
 		txCmd(cdc),
-		rpc.EmintServeCmd(cdc),
+		client.ValidateChainID(
+			rpc.EmintServeCmd(cdc),
+		),
 		flags.LineBreak,
 		client.KeyCommands(),
 		flags.LineBreak,