client: renaming to standard binary names (mkfs.xtreemfs, lsfs.xtreemfs,...

client: renaming to standard binary names (mkfs.xtreemfs, lsfs.xtreemfs, rmfs.xtreemfs, mount.xtreemfs, umount.xtreemfs)

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@1266 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534