Cannot delete objects with '#' in their name

[Yves-Gwenael Bourhis]

If someone creates a file called 'foo#1.txt' (e.g. via horizon) ospurge can not delete it because of:
https://storyboard.openstack.org/#!/story/2005828

[Yves-Gwenael Bourhis (yves-gwenael-bourhis)]

Fix proposed to branch: master
Review: https://review.opendev.org/663352

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/663352
Committed: https://git.openstack.org/cgit/x/ospurge/commit/?id=fc73a2e881c09a073c7e247d816ff1eaadbe0e90
Submitter: Zuul
Branch: master

commit fc73a2e881c09a073c7e247d816ff1eaadbe0e90
Author: Yves-Gwenael Bourhis <email address hidden>
Date: Wed Jun 5 16:48:18 2019 +0200

    Url quoting of swift object names when deleting

    shade sends the swift object or container name unquoted as an url and in
    shade.openstackcloud.py in get_object_metadata where OpenStackCloudException
    errors with 404 status_code are silently ignored.
    If the name contains special characters such as a '#' we therefore get no
    metadata without errors.
    The same thing happens after in shade.openstackcloud.py in delete_object when
    calling self._object_store_client.delete : an OpenStackCloudHTTPError is
    caught and the delete method returns False.
    This resulted in ospurge not deleting such objects without even getting
    an exception.
    After investigation, the issue would be the same in openstacksdk which
    copies the same code as shade.
    Since nor shade nor openstacksdks perform url encoding of the name, we url
    encode it ourselves before calling shade, since shade makes an http
    request by calling the swift api with the object name as an url.

    Closes-Bug: #1831753

    Change-Id: Ie7aea2a14d920ca11012ff26d7f74017704765f5