Do not expect success on token timeout

The retry logic should contain no expectations because it's expected to
fail sometimes and retry in such cases.

Author: Zerpet

Diff for: system_tests/utils.go

@@ -749,7 +749,7 @@ func publishAndConsumeMQTTMsg(hostname, nodePort, username, password string, ove
 		fmt.Printf("Attempt #%d to connect using MQTT\n", retry)
 		token = c.Connect()
 		// Waits for the network request to reach the destination and receive a response
-		Expect(token.WaitTimeout(3 * time.Second)).To(BeTrue())
+		token.WaitTimeout(3 * time.Second)
 
 		if err := token.Error(); err == nil {
 			break