[Merge] ~nteodosio/update-manager:main into update-manager:main

[Nathan Teodosio]

Nathan Teodosio has proposed merging ~nteodosio/update-manager:main into update-manager:main.

Requested reviews:
  Sebastien Bacher (seb128)

For more details, see:
https://code.launchpad.net/~nteodosio/update-manager/+git/update-manager/+merge/456053

Fix autopkgtest warning. Drop --format=json. 
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