Fix import in JmsDslKotlinTests.kt

https://build.spring.io/browse/INT-SI50X-43

Expire message groups for the `JdbcMessageStoreTests`

https://build.spring.io/browse/INT-FATS5IC-494

Author: artembilan

spring-integration-jdbc/src/test/java/org/springframework/integration/jdbc/store/JdbcMessageStoreTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2018 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -78,7 +78,8 @@ public class JdbcMessageStoreTests {
 
 	@Before
 	public void init() {
-		messageStore = new JdbcMessageStore(dataSource);
+		this.messageStore = new JdbcMessageStore(dataSource);
+		this.messageStore.expireMessageGroups(-1);
 	}
 
 	@Test

spring-integration-jms/src/test/kotlin/org/springframework/integration/jms/dsl/JmsDslKotlinTests.kt

@@ -27,7 +27,7 @@ import org.springframework.context.annotation.Configuration
 import org.springframework.integration.config.EnableIntegration
 import org.springframework.integration.dsl.IntegrationFlow
 import org.springframework.integration.dsl.IntegrationFlows
-import org.springframework.integration.dsl.MessageChannels
+import org.springframework.integration.dsl.channel.MessageChannels
 import org.springframework.integration.support.MessageBuilder
 import org.springframework.messaging.MessageChannel
 import org.springframework.messaging.PollableChannel