code: def complete_vrf_virtual(arg):
      
  
      ret = complete_vrf(arg)
  
      search_string = ''
      if arg is not None:
          search_string = '^%s' % arg
  
      if re.match(search_string, 'all'):
          ret.append('all')
  
      return ret
docs: Returns list of matching VRFs
  
          Includes "virtual" VRF 'all' which is used in search
          operations