Comment 8 for bug 1557584

Reviewed: https://review.openstack.org/295324
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=cab3d64cd92b0f2b2165e68ef370518a463b7a80
Submitter: Jenkins
Branch: stable/liberty

commit cab3d64cd92b0f2b2165e68ef370518a463b7a80
Author: Diana Clarke <email address hidden>
Date: Tue Mar 15 16:17:28 2016 -0400

    Fix retry mechanism for generator results

    Both v1 and v2 of the glance client return python generators in some
    cases (rather than fully fleshed out lists) which thwarts our retry
    mechanism. Convert generator results to a list, so that any potential
    exceptions get raised earlier rather than later, allowing for retries.

    Conflicts:

        /nova/tests/unit/image/test_glance.py

    Conflict notes: I couldn't add the following assert from master because
    client.api_servers didn't exist then. It was added in commit
    590b2c30073843f736680cdea4d6a6f8c673d725. Instead, I added one that
    follows the pattern at that time.

      self.assertEqual(str(client.api_server), "https://host2:9293")

    Change-Id: Ibc84f1596d4eaabdef0a48f6cf4da2d1323843a8
    Closes-Bug: #1557584
    (cherry picked from commit ae6d868e2f13f90d9f97c982fdbbccdc6fb8b9c9)