Fix warnings due to unused import statements

Issue: SPR-9431

spring-beans/src/test/java/org/springframework/beans/factory/support/BeanFactoryGenericsTests.java

@@ -47,8 +47,6 @@ import org.springframework.core.io.UrlResource;
 import org.springframework.tests.Assume;
 import org.springframework.tests.TestGroup;
 
-import org.springframework.tests.Assume;
-import org.springframework.tests.TestGroup;
 import org.springframework.tests.sample.beans.GenericBean;
 import org.springframework.tests.sample.beans.GenericIntegerBean;
 import org.springframework.tests.sample.beans.GenericSetOfIntegerBean;

spring-beans/src/test/java/org/springframework/beans/support/PagedListHolderTests.java

@@ -24,8 +24,6 @@ import org.junit.Test;
 import org.springframework.tests.Assume;
 import org.springframework.tests.TestGroup;
 
-import org.springframework.tests.Assume;
-import org.springframework.tests.TestGroup;
 import org.springframework.tests.sample.beans.TestBean;
 
 import static org.junit.Assert.*;

spring-beans/src/test/java/org/springframework/tests/beans/CollectingReaderEventListener.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2013 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.
@@ -29,7 +29,6 @@ import org.springframework.beans.factory.parsing.ComponentDefinition;
 import org.springframework.beans.factory.parsing.DefaultsDefinition;
 import org.springframework.beans.factory.parsing.ImportDefinition;
 import org.springframework.beans.factory.parsing.ReaderEventListener;
-import org.springframework.core.CollectionFactory;
 
 /**
  * @author Rob Harrop