TOMEE-786 avoid to create jta datasource for non jta ones by default (+ back to defaults from the spec) - prop openejb.autocreate.jta-datasource-from-non-jta-one still allows to reactivate this behavior

git-svn-id: https://svn.apache.org/repos/asf/tomee/tomee/trunk@1453715 13f79535-47bb-0310-9956-ffa450edef68