Fix outdated comment in KeystoneClientV3.

This patch fixes the outdated class comment for KeystoneClientV3.

Change-Id: I7735dd8b2c672cf9e40d01a6a72fd90f1540352a
Merge "Fix outdated comment in KeystoneClientV3."
Console url support in server resource

Add attribute console_url to server resource. This is a composite attribute
that returns a dict-like structure lazily resolving the console url
based on key supplied. Usage as following:

outputs:
  console:
    value: { get_attr: [server, console_url, novnc ] }

Change-Id: Id6e655b4a295ad6025cd753302f79258a9f8695e
Implements: blueprint vnc-console-attr