Code review comment for lp:~jtv/gwacl/storage-tool-command-line

Next time we have flag issues we could consider using go-flags <https://github.com/jessevdk/go-flags> or gnuflag <https://launchpad.net/gnuflag>. The latter is used in Juju, and was created by Roger Peppe. The Go standard library's flag package feels about as modern as pocket protectors and should be deprecated with fire.