Rename test class to adhere to conventions

Author: sbrannen

spring-tx/src/test/java/org/springframework/transaction/interceptor/RollbackRuleTests.java renamed to spring-tx/src/test/java/org/springframework/transaction/interceptor/RollbackRuleAttributeTests.java

@@ -34,7 +34,7 @@
  * @author Sam Brannen
  * @since 09.04.2003
  */
-class RollbackRuleTests {
+class RollbackRuleAttributeTests {
 
 	@Test
 	void constructorArgumentMustBeThrowableClassWithNonThrowableType() {