title: OpenStack keystoneclient get user by name
body: <p>I know it is possible to get a user by id but all I have available is the name.  Anyone know how to get a user by name using the keystone client v 2.0?</p>
  
  <pre><code>from keystoneclient.v2_0 import client
  keystone = client.Client(username=USER,
                           password=PASS,
                           tenant_name=TENANT_NAME,
                           auth_url=KEYSTONE_URL)
  user = keystone.users.get(USER_ID)
  </code></pre>
  
  <p><em><strong></em></strong> need something like the following <strong><em>*</em>*</strong>
  keystone.users.getByName(USER_NAME)</p>