Comment 8 for bug 1619274

Reviewed: https://review.openstack.org/372712
Committed: https://git.openstack.org/cgit/openstack/python-openstackclient/commit/?id=9484cd3850594ef6cb62d3c57dc5ec402305975c
Submitter: Jenkins
Branch: stable/newton

commit 9484cd3850594ef6cb62d3c57dc5ec402305975c
Author: Dean Troyer <email address hidden>
Date: Thu Sep 1 10:54:29 2016 -0500

    Defer auth prompting until it is actually needed

    Auth option prompting happens waaaay to early in the default
    os-client-config flow, we need to defer it until adter the commands
    have been parsed. This is why ClientManager.setup_auth() exists,
    as it is not called until the first attempt to connect to a server
    occurs. Commands that do not require authentication never hit this.

    Also, required options were not being enforced. By doing this we handle
    when no authentication info is present, we fail on missing auth-url rather
    than attempt to prompt for a password (default auth is password).

    Closes-Bug: 1619274
    Change-Id: Ia4eae350e6904c9eb2c8507d9b3429fe52418726
    (cherry picked from commit 14dbfe44741b65c9e0514a34669f52de8629b1c0)