Comment 2 for bug 1481567

The original error message is "Stderr: u'/usr/local/bin/manila-rootwrap: Unauthorized command: locate /bin/hdfs (no filter matched)\n'."
It looks like locate command wasn't included in share.filters file.
I also don't think it is a good way to find a command, so I register another bug to fix: "https://bugs.launchpad.net/manila/+bug/1481568"