title: How to update metadata flavor openstack using python novaclient?
body: <p>I can list and create flavor using this code:</p>
  
  <pre><code>flavors_list = nova_client.flavors.list()
  print_flavors(flavors_list)
  
  print(nova_client.servers.list())
  nova_client.flavors.create(name = 'test2', ram = 512, vcpus = 1, 
                         disk = 1000, 
                         flavorid='auto', ephemeral=0, swap=0, 
                         rxtx_factor=1.0, is_public=True)
  </code></pre>
  
  <p>But I can find method for update metadata flavor.</p>
  
  <p>Anybody know which method updates metadata flavor?</p>