Fix error messages for test-client in UDS mode

As an example, in UDS mode, certificates should not be provided, but the
error message reporting this was stating the opposite.

Signed-off-by: Antonin Bas <[email protected]>

Author: antoninbas

cmd/test-client/main.go

@@ -167,13 +167,13 @@ func (o *GrpcProxyClientOptions) Validate() error {
 	}
 	if o.proxyUdsName != "" {
 		if o.proxyHost != "" {
-			return fmt.Errorf("please do set proxy host when using UDS")
+			return fmt.Errorf("please set proxy host to \"\" when using UDS")
 		}
 		if o.proxyPort != 0 {
-			return fmt.Errorf("please do set proxy server port to 0 not %d when using UDS", o.proxyPort)
+			return fmt.Errorf("please set proxy server port to 0 when using UDS")
 		}
 		if o.clientKey != "" || o.clientCert != "" || o.caCert != "" {
-			return fmt.Errorf("please do set cert materials when using UDS, key = %s, cert = %s, CA = %s",
+			return fmt.Errorf("please do not set cert materials when using UDS, key = %s, cert = %s, CA = %s",
 				o.clientKey, o.clientCert, o.caCert)
 		}
 	}
@@ -231,7 +231,7 @@ type Client struct {
 func (c *Client) run(o *GrpcProxyClientOptions) error {
 	o.Print()
 	if err := o.Validate(); err != nil {
-		return fmt.Errorf("failed to validate proxy client options, got %v", err)
+		return fmt.Errorf("failed to validate proxy client options, got: %w", err)
 	}
 
 	// Run remote simple http service on server side as