cli: make tests pass using sync.Once (hack)
cli: make tests pass using sync.Once (hack)

- Not sure why, but unit tests are causing global verbosity flags
  to be added to the graph twice. There is probably a better fix than
  this.

opentable/sous,opentable/sous,opentable/sous,samsalisbury/sous,samsalisbury/sous,opentable/sous,samsalisbury/sous,samsalisbury/sous,opentable/sous,samsalisbury/sous