fix path in production mode

addressing:
ERROR: Failure: ImportError (No module named client.i18n)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/nose/loader.py", line 364, in loadTestsFromName
    addr.filename, addr.module)
  File "/usr/lib/python2.6/site-packages/nose/importer.py", line 39, in importFromPath
    return self.importFromDir(dir_path, fqname)
  File "/usr/lib/python2.6/site-packages/nose/importer.py", line 84, in importFromDir
    mod = load_module(part_fqname, fh, filename, desc)
  File "/usr/share/katello/tests/katello-cli/unit-tests/katello/__init__.py", line 7, in <module>
    from katello.client.i18n import configure_i18n
ImportError: No module named client.i18n
run unit test in %check phase
Merge pull request #36 from xsuchy/pull-req-fix-unit-tests

Fix unit tests and make them run in %check phase