Java-70 Remove unnecessary files from spring-jpa-2 + include in main persistence pom file

persistence-modules/pom.xml

@@ -78,6 +78,7 @@
         <module>spring-hibernate-5</module> <!-- long running -->
         <module>spring-hibernate4</module>
         <module>spring-jpa</module>
+        <module>spring-jpa-2</module>
         <!-- <module>spring-mybatis</module> --> <!-- needs fixing in BAEL-9021 -->
         <module>spring-persistence-simple</module>
         <module>spring-persistence-simple-2</module>