Tim Burke 9b0da49c0b Improve list --versions output
Have `--versions` imply `--long` and add a new column for version_id.

Also, have version-aware listings show all versions as "null" on old
Swifts that don't support object versioning (or when object versioning
is not enabled).

Change-Id: I0e009bce2471d1c140ac9b83700591cb355fee3f
2020-04-10 17:16:15 -07:00
..
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