contenty_type is missing for some exceptions

[Flavio Percoco]

In some HTTPExceptions[0] the content_type kwarg is missing and should be set to text/plain as in the other cases.

[0] https://github.com/openstack/glance/blob/master/glance/api/v1/upload_utils.py#L121

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/31223

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/31430

[sai krishna (krishna1256)]

Hi All,

Please Ignore the below review request.
https://review.openstack.org/31223

A new request is created with request number: 31430.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/31430
Committed: http://github.com/openstack/glance/commit/98dcfb4b90791e656a9558d768694a27bc90e3b5
Submitter: Jenkins
Branch: master

commit 98dcfb4b90791e656a9558d768694a27bc90e3b5
Author: sai krishna sripada <email address hidden>
Date: Sun Jun 2 18:13:42 2013 +0530

    updated content_type in the exception where it is missing.

    Fixes bug 1184279

    Added missing content_type in HTTPConflict, while attempting to upload a duplicate image.

    Change-Id: I4dbef69b6f9e83d4b5090cc0bbfcb01611c05a37