Fix split package introduced by @EnableSpringConfigured

Commit 5327a7a37d moved
@EnableSpringConfigured from beans.factory.aspectj =>
context.annotation within the spring-aspects module. This resolved a
package cycle but had the side-effect of causing a "split package" [1]
problem between spring-context and spring-aspects in OSGi-based
classloader environments because the context.annotation package now
exists in both modules.

The simplest and best solution from an OSGi perspective is to relocate
@EnableSpringConfigured and its supporting SpringConfiguredConfiguration
class into a new package. This commit moves both these types into
context.annotation.aspectj, following convention with other such
"aspectj"-qualified packages in the spring-aspects module.

As with the previous move, it is presumed this change will be low-impact
as the "spring-configured" approach to domain object injection is a
niche feature to begin with, and @EnableSpringConfigured has existed in
its current location only since 3.1.2 and this change is being made in
time for 3.1.3.

[1]: http://wiki.osgi.org/wiki/Split_Packages

Issue: SPR-9811, SPR-9441

spring-aspects/src/main/java/org/springframework/context/annotation/aspectj/EnableSpringConfigured.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.springframework.context.annotation;
+package org.springframework.context.annotation.aspectj;
 
 import java.lang.annotation.Documented;
 import java.lang.annotation.ElementType;

spring-aspects/src/main/java/org/springframework/context/annotation/aspectj/SpringConfiguredConfiguration.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.springframework.context.annotation;
+package org.springframework.context.annotation.aspectj;
 
 import org.springframework.beans.factory.aspectj.AnnotationBeanConfigurerAspect;
 import org.springframework.beans.factory.config.BeanDefinition;

spring-aspects/src/test/java/org/springframework/context/annotation/aspectj/AnnotationBeanConfigurerTests.java

@@ -14,10 +14,14 @@
  * limitations under the License.
  */
 
-package org.springframework.context.annotation;
+package org.springframework.context.annotation.aspectj;
 
 import org.springframework.beans.factory.aspectj.AbstractBeanConfigurerTests;
 import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.ImportResource;
+import org.springframework.context.annotation.aspectj.EnableSpringConfigured;
 
 /**
  * Tests that @EnableSpringConfigured properly registers an