object list --delimiter returns empty strings

[Leopold Talirz]

I'm trying to use the `--delimiter /` option to get a list of subdirectories in a container.
Using python-swiftclient it works:

$ swift list backup-dev-tools --delimiter /
abc/
logs/

With the python-openstackclient, however, I get

$ openstack object list backup-dev-tools --delimiter /
+------+
| Name |
+------+
| |
| |
+------+

I believe the reason is that the format of the RESP BODY dictionary changes when you specify the --delimiter option.

With --delimiter:
RESP BODY: [{"subdir": "abc/"}, {"subdir": "logs/"}]
Without --delimiter:
RESP BODY: [{"hash": "d41d8cd98f00b204e9800998ecf8427e", "last_modified": "2017-12-11T11:45:43.340020", "bytes": 0, "name": "abc/", "content_type": "application/octet-stream"}, ...]

I.e. it should show be using the 'subdir' key instead of the 'name' key, when specifying --delimiter.