WFLY-2665 Make JPA statistics enabling config consistent with other subsystems

This is the JPA changes that I think should go with https://github.com/wildfly/wildfly/pull/5609 (if pr#5609 gets merged).  This pull request brings in jipijapa 1.0.1.CR1 (which now has "statistics-enabled" in addition to "enabled" attribute) for Hibernate.