keystoneauth doesn't support auth receipts or MFA

[Adrian Turjak]

keystoneauth needs to raise a specific catchable error when a 401 with an auth receipt is returned.

It also needs a way to continue auth with that receipt, or even do multi-method auth to avoid needing a receipt up front.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/675049
Committed: https://git.openstack.org/cgit/openstack/keystoneauth/commit/?id=6a69e4dfbdc2762445b0f16a9e2c66e06f3b2bab
Submitter: Zuul
Branch: master

commit 6a69e4dfbdc2762445b0f16a9e2c66e06f3b2bab
Author: Adrian Turjak <email address hidden>
Date: Wed Aug 7 19:51:59 2019 +1200

    add support for auth_receipts and multi-method auth

    - new exception when an auth receipt is returned.
    - a new method for auth receipt.
    - support to existing v3 Auth plugins to add additional methods.
    - Added a new MultiFactor plugin with loading support which
      takes method names as strings.

    Change-Id: Ie6601a50011118e3a07be9752f747c2298ff5230
    Closes-Bug: #1839748

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/keystoneauth 3.17.0 release.