GS-10977

Add support for Before Change space filter (no after change at the moment).
One can obtain the change set using the ChangeDataSyncOperation.getChangeSet(ISpaceFilterEntry) on the filter entry.

git-svn-id: svn://pc-lab14/SVN/xap/trunk/openspaces@138485 eb64e737-3616-4df0-8941-5ee2ae88103d