docs: def update_metadata_image(sdc_url, token, vdc, product, metadata_image):
      """It updates the product metadada for image filtered
      :param glance_url: the sdc url
      :param token: the valid token
      :param metadata_image: image name
      :param product: image name
  
      """
      print 'update metadata' 
      print product
      url = sdc_url+ "/catalog/product/"+product
      print url
      headers = {'X-Auth-Token': token, 'Tenant-Id': vdc,
                 'Accept': "application/json",
                 'Content-Type': 'application/json'}
      print headers
      response = http.get(url, headers)
      print url
      if response.status != 200:
          print 'error to get the product ' + str(response.status)
          return
      else:
         
          payload = '{"key":"image","value":"' + metadata_image + '"}'
          print payload
          response = http.put(url + "/metadatas/image", headers, payload)
          print response
          if response.status != 200:
              print 'error to update the product ' + product \
                    + ' ' + str(response.status)