When hibernate module is running within servlet container, we should
check if http module is being used and make sure that we use
same cache-xml and log-file properties.
clear() - Method in class com.gemstone.gemfire.modules.hibernate.GemFireCache
Returns the region if already created, otherwise first tries to create it
from cache.xml, if not specified in cache.xml, create the region from the
properties specified in hibernate.cfg.xml.