Missing headers in cURL examples in federation docs.

[Marek Denis]

cURL examples depicting fetching accessible projects and domains should also include directives for sending X-Auth-Token header along with the unscoped token.

Reference: https://github.com/openstack/keystone/blob/master/doc/source/configure_federation.rst#example-curl-1

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/109614

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/109614
Committed: https://git.openstack.org/cgit/openstack/keystone/commit/?id=e59cfa07dc319fb256d92a78c26c0142a0bc11e6
Submitter: Jenkins
Branch: master

commit e59cfa07dc319fb256d92a78c26c0142a0bc11e6
Author: Marek Denis <email address hidden>
Date: Fri Jul 25 16:49:06 2014 +0200

    Add X-Auth-Token header in federation examples

    cURL examples depicting fetching accessible projects and domains upon
    successfull retrieving federated unscoped token should also include
    ``X-Auth-Token`` header.
    This patch adds headers to the examples.

    Change-Id: I463e34511b8f9b19012fce955f04a0269d5de9cd
    Closes-Bug: #1348680