cobbler needs to know 'fedora' OS entry

other fedora\d\d entries aren't used by Spacewalk

addressing:
Tue Sep 30 09:27:43 2014 - INFO | Exception occured: <class 'cobbler.cexceptions.CX'>
Tue Sep 30 09:27:43 2014 - INFO | Exception value: '--os-version for breed redhat must be one of rhel2.1, rhel3, rhel4, rhel5, rhel6, rhel7, fedora5, fedora6, fedora7, fedora8, fedora9, fedora10, fedora11, fedora12, fedora13, fedora14, fedora15, fedora16, fedora17, fedora18, fedora19, fedora20, generic24, generic26, virtio26, other, given was fedora'
Tue Sep 30 09:27:43 2014 - INFO | Exception Info:
  File "/usr/lib/python2.6/site-packages/cobbler/remote.py", line 1766, in _dispatch
    return method_handle(*params)
   File "/usr/lib/python2.6/site-packages/cobbler/remote.py", line 766, in modify_distro
    return self.modify_item("distro",object_id,attribute,arg,token)
   File "/usr/lib/python2.6/site-packages/cobbler/remote.py", line 763, in modify_item
    return method(arg)
   File "/usr/lib/python2.6/site-packages/cobbler/item_distro.py", line 174, in set_os_version
    return utils.set_os_version(self,os_version)
   File "/usr/lib/python2.6/site-packages/cobbler/utils.py", line 1258, in set_os_version
    raise CX(_("--os-version for breed %s must be one of %s, given was %s") % (self.breed, nicer, os_version))
Automatic commit of package [cobbler20] minor release [2.0.11-36].