client: Tools (mkfs,rmfs,lsfs) do no longer output the whole help in case an...

client: Tools (mkfs,rmfs,lsfs) do no longer output the whole help in case an invalid parameter was given.

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@3284 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534