Remove agent string

The agent string was inspired by the HTTP User-Agent header to serve as
a way to identify what's connecting to the cluster.  While there may
have been vision of other software connecting to a controller than the
Clusterio provided ones this seems highly unlikely to ever happen.

Remove redundant agent string for now.

packages/controller/src/ControlConnection.ts

@@ -24,7 +24,6 @@ const queryLogTime = new lib.Summary(
  * @alias module:controller/src/ControlConnection
  */
 export default class ControlConnection extends BaseConnection {
-	private _agent: string;
 	private _version: string;
 	logTransport: lib.LinkTransport | null = null;
 	logSubscriptions = {
@@ -38,7 +37,7 @@ export default class ControlConnection extends BaseConnection {
 	declare connector: WsServerConnector;
 
 	constructor(
-		registerData: { agent:string, version:string },
+		registerData: { version: string },
 		connector: WsServerConnector,
 		controller: Controller,
 		public user: ControllerUser, // The user making this connection.
@@ -46,7 +45,6 @@ export default class ControlConnection extends BaseConnection {
 	) {
 		super(connector, controller);
 
-		this._agent = registerData.agent;
 		this._version = registerData.version;
 
 		this.connector.on("connect", () => {

packages/controller/src/HostConnection.ts

@@ -16,7 +16,6 @@ import HostInfo from "./HostInfo";
  * @alias module:controller/src/HostConnection
  */
 export default class HostConnection extends BaseConnection {
-	private _agent: string;
 	private _id: number;
 	private _name: string;
 	private _version: string;
@@ -29,7 +28,6 @@ export default class HostConnection extends BaseConnection {
 	) {
 		super(connector, controller);
 
-		this._agent = registerData.agent;
 		this._id = registerData.id;
 		this._name = registerData.name;
 		this._version = registerData.version;
@@ -38,7 +36,6 @@ export default class HostConnection extends BaseConnection {
 
 		const previousHostInfo = this._controller.hosts.get(this._id);
 		const currentHostInfo = new HostInfo(
-			this._agent,
 			this._id,
 			this._name,
 			this._version,

packages/controller/src/HostInfo.ts

@@ -6,8 +6,6 @@ import { HostDetails } from "@clusterio/lib";
  */
 export default class HostInfo {
 	constructor(
-		/** Agent this host last connected with */
-		public agent: string,
 		/** Id of this host */
 		public id: number,
 		/** Version this host last connected with */
@@ -29,7 +27,6 @@ export default class HostInfo {
 	) { }
 
 	static jsonSchema = Type.Object({
-		"agent": Type.String(),
 		"id": Type.Number(),
 		"name": Type.String(),
 		"version": Type.String(),
@@ -43,7 +40,6 @@ export default class HostInfo {
 
 	static fromJSON(json: Static<typeof this.jsonSchema>) {
 		return new this(
-			json.agent,
 			json.id,
 			json.name,
 			json.version,
@@ -58,7 +54,6 @@ export default class HostInfo {
 
 	toJSON(): Static<typeof HostInfo.jsonSchema> {
 		return {
-			agent: this.agent,
 			id: this.id,
 			name: this.name,
 			version: this.version,
@@ -73,7 +68,6 @@ export default class HostInfo {
 
 	toHostDetails() {
 		return new HostDetails(
-			this.agent,
 			this.version,
 			this.name,
 			this.id,

packages/controller/src/WsServer.ts

@@ -261,9 +261,9 @@ ${err.stack}`
 		}
 
 		logger.info(
-			`WsServer | registered host ${data.name} (${data.id}) using agent ${data.agent} ${data.version}`
+			`WsServer | registered host ${data.name} (${data.id}) using version ${data.version}`
 		);
-		if (data.agent === "Clusterio Host" && data.version !== packageVersion) {
+		if (data.version !== packageVersion) {
 			logger.warn(
 				`Host ${data.name} (${data.id}) connected using version ${data.version} which does not match the ` +
 				`version of the controller is currently running (${packageVersion}). It may not work as expected.`