ISSUE-283 fix checkstyle

Author: eutkin

cluster/src/test/java/io/scalecube/cluster/ClusterTest.java

@@ -7,7 +7,6 @@
 import io.scalecube.cluster.membership.MembershipEvent;
 import io.scalecube.cluster.membership.MembershipEvent.Type;
 import io.scalecube.cluster.metadata.MetadataDecoder;
-import io.scalecube.cluster.transport.api.MessageCodec;
 import io.scalecube.net.Address;
 import java.net.InetAddress;
 import java.time.Duration;

cluster/src/test/java/io/scalecube/cluster/gossip/GossipRequestTest.java

@@ -1,21 +1,22 @@
 package io.scalecube.cluster.gossip;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
 import io.scalecube.cluster.BaseTest;
 import io.scalecube.cluster.Member;
 import io.scalecube.cluster.transport.api.Message;
 import io.scalecube.cluster.transport.api.MessageCodec;
 import io.scalecube.net.Address;
-import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.Test;
-
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
-
-import static org.junit.jupiter.api.Assertions.*;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 
 public class GossipRequestTest extends BaseTest {