Downloading ec2 creds doesn't work if nova is at newton or newer

[Sam Morrison]

In Newton nova removed the nova-cert process. This means downloading the ec2 certificates doesn't work anymore. Getting the EC2 credentials from keystone still works so just need to only return EC2 creds now.

[David Lyle (david-lyle)]

python-novaclient has removed support for the ec2 certs functionality

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/537685

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/537685
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=f25748293e89ffb0231ed048b41c0025328c27fb
Submitter: Zuul
Branch: master

commit f25748293e89ffb0231ed048b41c0025328c27fb
Author: David Lyle <email address hidden>
Date: Wed Jan 24 15:05:17 2018 -0700

    Handle novaclient ec2 cert support removal

    In Queens, ec2 cert support was removed from python-novaclient.
    This causes horizon to be unable to get the keystone values of
    ec2 credentials.

    This patch removes the code that handles ec2 certs from nova.
    Since the ec2 cert code in nova was removed in Mitaka. There is
    no real risk of breaking backwards compatibility.

    Change-Id: I470761d67004f6e6b188d3afc4b7f081b7bc708f
    Closes-Bug: #1729175

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/horizon 13.0.0.0rc1 release candidate.