Image update incorrectly sets headers

[Maithem]

In line : https://github.com/openstack/python-glanceclient/blob/master/glanceclient/v1/images.py#L271 if kwargs doesnt have the 'purge_props' key, then hdrs['x-glance-registry-purge-props'] won't be set to 'false'. If the key 'purge_props' isn't in kwargs then an exception would be thrown and

 else:
            hdrs['x-glance-registry-purge-props'] = purge_props

won't be evaluated.

Expected:
The glance registry headers should be set correctly in order to expect consistent results.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/93162

[OpenStack Infra (hudson-openstack)]

Change abandoned by Maithem (<email address hidden>) on branch: master
Review: https://review.openstack.org/93162

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/93162
Committed: https://git.openstack.org/cgit/openstack/python-glanceclient/commit/?id=cddc37dcab80eec3eb3b9a2849c09c1ae3892381
Submitter: Jenkins
Branch: master

commit cddc37dcab80eec3eb3b9a2849c09c1ae3892381
Author: Maithem <email address hidden>
Date: Fri May 9 17:25:05 2014 -0700

    Set purge-props header correctly in image update

    Currently when an image is updated, the purge property
    header is only set to true in some cases, but when
    required it isn't set to false

    Change-Id: I885a82643d2620f393f21c36b3ad95cb7ed43f2c
    Closes-Bug: 1318079