change default cache region name

Background:
* we monitor our caches using collected:
** we expose ehcache via jmx
** iterate over mbeans
** create standard collectd message from mbean attributes and send to deamon

Collectd limits metric identifiers to 64 symbols. We configured shortened region names for our entities, however it is not possible to define sortened name for UpdateTimestampsCache and StandardQueryCache.

Currently, by default they use "org.hibernate.cache.spi.UpdateTimestampsCache" and "org.hibernate.cache.internal.StandardQueryCache".