utils: cannot create vdi in some cases
utils: cannot create vdi in some cases

Previously, it could not create a volume in some specific cases.
This was a problem with the search string used in the program.

e.g.
    $ docker volume create -d sheepdog vol11
    $ docker volume create -d sheepdog vol1
    (it's doesn't work...)

After this fix, docker volume create works fine.

Signed-off-by: Kazuhisa Hara <8395661aa7021e813cfe730bdc93dd1e78cf90f2@sios.com>

kazuhisya/docker-volume-sheepdog