From Gerri:

- fix issue giving a "permission denied" in the creation of a subdirectory to
  store credentials for authentication
- fix issue breaking the shutdown machinery in the case of multiple
  connections/disconnections.


git-svn-id: http://root.cern.ch/svn/root/trunk@17690 27541ba8-7e3a-0410-8455-c3a389f83636