[Rpm-metadata] Trivial createrepo fixes

[Ville Skyttä]

Here's a couple of trivial createrepo fixes, inspired by:

  $ createrepo --version
  Error: Only one directory allowed per run.
  [Usage message here]

The patch fixes --help and --version to work the way I assume they were
intended to be (not the prettiest way to fix 'em though), improves a
couple of error messages and fixes the exit code of --help.

BTW, I didn't find a createrepo/metadata component in
https://devel.linux.duke.edu/bugzilla/ ...
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