When k8s present, allow filtering of containers by namespace (take 2) #2362
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Re-applies #2285 (reverted in #2348)
and fixes the bug(s) that prompted the revert, which turned out to be a matter of accidentially mutating
objects in a variety of ways, some of which were introduced by #2285 but
others that weren't, but were exposed as a problem due to changing the operation from a set to an append.
Fixes #1504