* MRC: added support for password-based authorization of operations like...

* MRC: added support for password-based authorization of operations like volume creation, database dumping and shutdown
* DIR: removed obsolete config properties

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@576 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534