ooi throws misleading error if token is not scoped

[Alvaro Lopez]

When we receive a token that is not scoped, we simply throw back:

    Malformed request URL: URL's project_id 'None' doesn't match Context's project_id 'None'

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/452161

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/452161
Committed: https://git.openstack.org/cgit/openstack/ooi/commit/?id=0549ee16cb52d46bdc598943e2fa985ad9442339
Submitter: Jenkins
Branch: master

commit 0549ee16cb52d46bdc598943e2fa985ad9442339
Author: Alvaro Lopez Garcia <email address hidden>
Date: Fri Mar 31 13:34:36 2017 +0200

    Check if project id is None from headers

    To check if the user was providing a scoped token we were relying on the
    "HTTP_X_PROJECT_ID" environment variable, relying on a KeyError
    exception when accessing the dictionary. However, the variable can be
    empty, resulting in a dictionary key "HTTP_X_PROJECT_ID":None. As a
    consequence, we were using None as the project ID, resulting in
    misleading errors.

    Closes-bug: #1678060
    Change-Id: I1956fd99be5771371b1d3401e335528c5cc6455e