Make ostree admin --help output more helpful

[Matthias Clasen <matthias clasen gmail com>]

Here is a patch to make ostree admin --help list available subcommands.
Not quite perfect yet - e.g. ostree admin init --help does not work as expected.

Here's a few more-or-less related questions:

- What is the relation between ostree init and ostree admin init ?

- Should ostadmin still be built in gnome-ostree, now that ostree admin exists ?

Attachment: 0001-Make-ostree-admin-help-output-more-useful.patch
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