Removed unnecessary imports

spring-cloud-sleuth-core/src/main/java/org/springframework/cloud/sleuth/instrument/web/client/feign/TraceFeignClientAutoConfiguration.java

@@ -27,7 +27,6 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
-import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.cloud.openfeign.FeignAutoConfiguration;
 import org.springframework.cloud.openfeign.FeignContext;
 import org.springframework.cloud.sleuth.instrument.hystrix.SleuthHystrixAutoConfiguration;

spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/annotation/SleuthSpanCreatorAspectTests.java

@@ -22,7 +22,6 @@ import java.util.stream.Collectors;
 
 import brave.Span;
 import brave.Tracer;
-import brave.Tracing;
 import brave.sampler.Sampler;
 import zipkin2.Annotation;
 import zipkin2.reporter.Reporter;

spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/async/issues/issue410/Issue410Tests.java

@@ -24,7 +24,6 @@ import java.util.concurrent.atomic.AtomicReference;
 
 import brave.Span;
 import brave.Tracer;
-import brave.Tracing;
 import brave.sampler.Sampler;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;

spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/messaging/MessageHeaderPropagationTest.java

@@ -19,11 +19,9 @@ package org.springframework.cloud.sleuth.instrument.messaging;
 import java.util.Collections;
 
 import brave.propagation.Propagation;
-import org.junit.Assert;
 import org.junit.Test;
 import org.springframework.messaging.support.MessageHeaderAccessor;
 
-import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.Assert.*;
 
 public class MessageHeaderPropagationTest

spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/messaging/TraceMessagingAutoConfigurationTests.java

@@ -35,7 +35,6 @@ import org.springframework.context.annotation.Configuration;
 import org.springframework.kafka.annotation.KafkaListener;
 import org.springframework.kafka.core.ConsumerFactory;
 import org.springframework.kafka.core.ProducerFactory;
-import org.springframework.kafka.listener.adapter.MessagingMessageListenerAdapter;
 import org.springframework.test.context.junit4.SpringRunner;
 
 import static org.assertj.core.api.BDDAssertions.then;

spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/reactor/SpanSubscriberTests.java

@@ -20,9 +20,7 @@ import java.util.concurrent.atomic.AtomicReference;
 
 import brave.Span;
 import brave.Tracer;
-import brave.Tracing;
 import brave.sampler.Sampler;
-import org.junit.BeforeClass;
 import reactor.core.publisher.BaseSubscriber;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Hooks;

spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/reactor/sample/FlatMapTests.java

@@ -40,7 +40,6 @@ import org.springframework.cloud.sleuth.util.ArrayListSpanReporter;
 import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
-import org.springframework.context.annotation.Import;
 import org.springframework.core.env.Environment;
 import org.springframework.web.reactive.function.client.ClientResponse;
 import org.springframework.web.reactive.function.client.WebClient;
@@ -49,7 +48,6 @@ import org.springframework.web.reactive.function.server.ServerResponse;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Hooks;
 import reactor.core.publisher.Mono;
-import reactor.core.scheduler.Scheduler;
 import reactor.core.scheduler.Schedulers;
 import zipkin2.Span;
 

spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/web/TraceAsyncIntegrationTests.java

@@ -21,7 +21,6 @@ import java.util.concurrent.atomic.AtomicReference;
 
 import brave.Span;
 import brave.Tracer;
-import brave.Tracing;
 import brave.sampler.Sampler;
 import org.awaitility.Awaitility;
 import org.junit.After;

spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/web/TraceWebFluxTests.java

@@ -16,8 +16,6 @@
 
 package org.springframework.cloud.sleuth.instrument.web;
 
-import java.util.Random;
-
 import brave.Span;
 import brave.Tracer;
 import brave.sampler.Sampler;

spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/web/client/MultipleAsyncRestTemplateTests.java

@@ -24,7 +24,6 @@ import java.util.concurrent.atomic.AtomicBoolean;
 
 import brave.Span;
 import brave.Tracer;
-import brave.Tracing;
 import brave.sampler.Sampler;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;

spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/web/client/discoveryexception/WebClientDiscoveryExceptionTests.java

@@ -22,7 +22,6 @@ import java.util.Map;
 
 import brave.Span;
 import brave.Tracer;
-import brave.Tracing;
 import brave.sampler.Sampler;
 import zipkin2.reporter.Reporter;
 import org.assertj.core.api.Assertions;

spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/web/client/integration/WebClientTests.java

@@ -47,7 +47,6 @@ import org.apache.http.impl.client.BasicResponseHandler;
 import org.apache.http.impl.client.HttpClientBuilder;
 import org.apache.http.impl.nio.client.CloseableHttpAsyncClient;
 import org.apache.http.impl.nio.client.HttpAsyncClientBuilder;
-import org.assertj.core.api.BDDAssertions;
 import org.awaitility.Awaitility;
 import org.junit.After;
 import org.junit.BeforeClass;