servers: cleanup-tool: added: MRC identifies replicas on OSD not longer...

servers: cleanup-tool: added: MRC identifies replicas on OSD not longer available on the XLoc-list and marks them as zombies

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@853 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534