Handle session timeout in the VMware store

[Arnaud Legendre]

The current implementation can potentially lead to a timeout when the invoke_api is not triggered (for example PUT/GET: direct HTTP access to the datastore).
We need to recreate the session responses and retry when getting 401 HTTP responses.

[Openstack Gerrit (openstack-gerrit)]

Fix proposed to branch: master
Review: https://review.openstack.org/89989

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/89989
Committed: https://git.openstack.org/cgit/openstack/glance/commit/?id=e5e76fffbddddf8e6cd8e0b0b1173d4cca53fafe
Submitter: Jenkins
Branch: master

commit e5e76fffbddddf8e6cd8e0b0b1173d4cca53fafe
Author: Arnaud Legendre <email address hidden>
Date: Wed May 28 17:00:16 2014 -0700

    Handle session timeout in the VMware store

    The current implementation can lead to session timeouts. This
    will occur when accessing the datastore directly through HTTP.
    This patch provides a retry mechanism by recreating the session
    when getting a 401 status code.

    Change-Id: I54cc9e30c9bc374a2cf82dec4beb9b06594835f8
    Closes-Bug: #1311960