MRC: statvfs now reports a block size that matches the default stripe size of...

MRC: statvfs now reports a block size that matches the default stripe size of the volume's root directory

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@1015 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534