SwiftSignalHandle doesn't correctly handle deletes for missing resources

[Randall Burt]

SwiftSignalHandle throws an exception if it attempts to delete an object that had previously been deleted out-of-band. The offending code is:

if sc.is_not_found(exc)

when sc is the actual client rather than the client plugin. This prevents a stack from being deleted.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/129345

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/129345
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=e83f785ece70755a65dd736d9f213255a8a3d376
Submitter: Jenkins
Branch: master

commit e83f785ece70755a65dd736d9f213255a8a3d376
Author: Randall Burt <email address hidden>
Date: Fri Oct 17 12:59:57 2014 -0500

    Use correct object when deleting

    SwiftSignalHandle was using the client object instead
    of the client plugin object to check for Not Found
    during delete. Also normalized access to the client
    and plugin as well as remove a few pep8 warning items.

    Change-Id: Ib73cb3846feb6ccb2e45859458008a1701aa2231
    Closes-Bug: #1382226