Automatically close logs and message stores when session connector is closed.

When you use a FileStoreFactory as a MessageFactory for "Acceptor" QFJ applications, it does not seem to close or delete files associated with a particular session.

For example, when i connect to my acceptor (running on Linux) with a new dynamic session, i can see the new set of files being created for it.
I can run 'lsof +p <pid> ' and see the files being open for the session.

When i kill my initiator and force a disconnect, the files still remain open - i can still see them in the output of lsof command.

So after a long running time and lots of incoming connections the acceptor application ends up running out of file descriptors.

I stepped through the code and it looks like the files are being closed in the Session.disconnect() --> FileStore.reset() call, but somehow the file descriptors still show up in use.