User provided headers should not be changed

[David Hadas]

In order to support Swift extendability
Swift and Swift middleware should avoid changing user provided headers unless required by function.

tempauth changes HTTP_X_AUTH_TOKEN although not required by function (it is done for logging purposes according to the comment just bfore the change), preventing extendability (prevents other middleware to rely on HTTP_X_AUTH_TOKEN representing the token sent by the client).

For example, placement control extension to Swift may require the token to be unchanged to allow active redirecting of calls to remote clusters.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/32370

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/32370
Committed: http://github.com/openstack/swift/commit/69f58f72a5a3778d7b09c8873c3d1aad4fa51373
Submitter: Jenkins
Branch: master

commit 69f58f72a5a3778d7b09c8873c3d1aad4fa51373
Author: David Hadas <email address hidden>
Date: Mon Jun 10 13:18:42 2013 +0300

    Tempauth - remove change made to HTTP_X_AUTH_TOKEN

    tempauth changes HTTP_X_AUTH_TOKEN although not required by function
    preventing swift extendability.
    (prevents other middleware to rely on HTTP_X_AUTH_TOKEN representing
    the token sent by the client).

    Change-Id: I7ed6f9b5d0a5a203326a3912ef27cf29d2d4e9ce
    Fixes: Bug #1189410