QEMU::Img.sanitize_file_or_dirname for gluster://

On local dirs and files, spaces or brackets in pathnames
are accepted instead, using quotes would just work.
Merge branch 'master' into v12n
chilli: always update statip and dynip
Merge branch 'master' of github.com:gderosa/onboard
Merge branch 'master' into v12n
Merge branch 'master' into margay