Fallback on missing bulk delete support

[cyberduck]

0116e36 created the issue

In Openstack Swift (Keystone) provider cyberduck uses bulk-delete requests for deleting objects and containers. But not all swift's clusters enable this feature.

When trying delete container on clusters, where bulk-requests disabled, we got response "409 Conflict", because objects inside still not deleted.

So, maybe cyberduck should use "delete-per-object" requests if it got 409 response on bulk delete?

[cyberduck]

@dkocher commented

In 114ad41.

[cyberduck]

@dkocher commented

#7604 closed as duplicate.

[cyberduck]

501f426 commented

Still doesn't work, build 13981