prameswar f44006a219 Changed Optional to Positional arg in zun pull
zun help pull
usage: zun pull -r <repo>

Pull an image.

Optional arguments:
  -r <repo>, --repo <repo> image repo

repo is required argument so we can make
it positional and can make it like docker:

docker pull cirros
zun pull cirros

Closes-Bug: #1658674

Change-Id: Iabbedc3e52a5c3f4db93eff052029d0fa2afff0e
2017-01-23 14:09:52 +00:00
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