client: xtfsutil: Fixed bug that partial replicas could not be read (OSD

logged error "Set Replication Strategy not known (0).") when the default
replication policy was set with the alias "readonly" and not "ronly".


git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@3329 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534