client: Fix problem that the client fails to start and outputs the error...

client: Fix problem that the client fails to start and outputs the error message "fuse: unknown option" if multiple DIRs are given at the command line. Fixes issue 267.

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@3690 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534