CAY-1883 - Clean up Cayenne maven structure - get rid of aggregate modules

* removing aggregation from server and client - they are normal modules now

git-svn-id: https://svn.apache.org/repos/asf/cayenne/main/trunk@1542573 13f79535-47bb-0310-9956-ffa450edef68
CAY-1883 - Clean up Cayenne maven structure - get rid of aggregate modules

* maven-remote-resources-plugin -> inherit version

git-svn-id: https://svn.apache.org/repos/asf/cayenne/main/trunk@1542574 13f79535-47bb-0310-9956-ffa450edef68