[#521] Remove unused imports (#522)

Signed-off-by: mxsm <ljbmxsm@gmail.com>

Author: mxsm

examples/restful-ws-quarkus/src/test/java/io/cloudevents/examples/quarkus/UserResourceTest.java

@@ -4,7 +4,6 @@
 import org.junit.jupiter.api.Test;
 
 import static io.restassured.RestAssured.given;
-import static org.hamcrest.CoreMatchers.is;
 
 @QuarkusTest
 public class UserResourceTest {

http/restful-ws-integration-tests/restful-ws-spring/src/test/java/io/cloudevents/http/restful/ws/spring/JerseyConfig.java

@@ -22,8 +22,6 @@
 import org.glassfish.jersey.server.ResourceConfig;
 import org.springframework.context.annotation.Configuration;
 
-import javax.ws.rs.ApplicationPath;
-
 @Configuration
 public class JerseyConfig extends ResourceConfig {
     public JerseyConfig() {

http/vertx/src/test/java/io/cloudevents/http/vertx/VertxHttpClientRequestMessageWriterTest.java

@@ -24,9 +24,6 @@
 import io.vertx.core.MultiMap;
 import io.vertx.core.Vertx;
 import io.vertx.core.buffer.Buffer;
-import io.vertx.core.http.HttpClient;
-import io.vertx.core.http.HttpClientRequest;
-import io.vertx.core.http.HttpMethod;
 import io.vertx.ext.web.client.WebClient;
 import io.vertx.junit5.Checkpoint;
 import io.vertx.junit5.VertxExtension;

http/vertx/src/test/java/io/cloudevents/http/vertx/VertxHttpServerResponseMessageWriterTest.java

@@ -19,13 +19,11 @@
 
 import io.cloudevents.CloudEvent;
 import io.cloudevents.SpecVersion;
-import io.cloudevents.core.message.impl.GenericStructuredMessageReader;
 import io.cloudevents.core.mock.CSVFormat;
 import io.cloudevents.types.Time;
 import io.vertx.core.MultiMap;
 import io.vertx.core.Vertx;
 import io.vertx.core.buffer.Buffer;
-import io.vertx.core.http.HttpClient;
 import io.vertx.ext.web.client.WebClient;
 import io.vertx.junit5.Checkpoint;
 import io.vertx.junit5.VertxExtension;