Document 2lc/JTA integration properties and add better detection of ehcache/JTA platform class use

Document the "wildfly.jpa.regionfactory" and "wildfly.jpa.jtaplatform" properties for Hibernate ORM 5.3+ integration.

Also automatically treat "wildfly.jpa.regionfactory" as false if ehcache is being used (e.g. check if the hibernate.cache.region.factory_class value starts with "net.sf.ehcache"). This should help applications that have configured to use Ehcache.

Also automatically treat "wildfly.jpa.jtaplatform" as false if the application sets "hibernate.transaction.jta.platform". This should help applications that have configured the transaction platform class.