delete_container doesn't provide arg for headers

[Ryan Brady]

Issue:

The usage of the swiftclient library is inconsistent due to lack of headers support.

The put_container method provides a 'headers' arg that allows you to pass headers through to the API.

The delete_container does not provide access to a 'headers' arg. This makes it difficult to send headers to middleware, e.g. trying to use bulk delete in swift middleware impossible with current swiftclient state.

Proposed solution:
Add headers arg to delete_container and update method to treat it similarly to the arg in put_container.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/372656

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/372656
Committed: https://git.openstack.org/cgit/openstack/python-swiftclient/commit/?id=6cf2bd6626df8e4c68bd5463d9b030e315f76b42
Submitter: Jenkins
Branch: master

commit 6cf2bd6626df8e4c68bd5463d9b030e315f76b42
Author: Charles Hsu <email address hidden>
Date: Mon Sep 19 23:18:18 2016 +0800

    Add additional headers for HEAD/GET/DELETE requests.

    Change-Id: I69276ba711057c122f97deac412e492e313c34dd
    Closes-Bug: 1615830

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/python-swiftclient 3.2.0 release.