Make debug API compatible with auth (1.11.x)

[brycemcanally]

1.11.x PR for #5471

[msteffen]

LGTM

FWIW, I typically don't seek approval for 1.11.x PRs if they're identical (i.e. a rebase) of changes that were already reviewed and approved in the master branch. Maybe that's a mistake, though my understanding is that this is Pachyderm's recommended practice.

Is this branch different from the master version? I didn't notice the differences if so.

[brycemcanally]

I think it would be a good idea to seek a review / approval for all PRs that will be going into a release branch. Even if the change is identical to a change on master, it would be good to have a sanity check to make sure it is indeed identical (and that it should be identical in the release branch). @jdoliner and / or @nitinjainsj should probably decide on this, but my opinion is that a review / approval should be required for anything that is going into a release.