Create the new AbstractConfigurableCacheFactoryBean class.

The intent of this abstract class is to encapsulate externalized configuration metadata applied to the cache such as Apache Geode native cache.xml as well as gemfire.properties.

This abstract class also handles any additional component configuration related to external configuration metadata handling, such as configuration applied and processed by the GemfireBeanFactoryLocator.

Resolves spring-projectsgh-493.

Author: jxblum