[Bug 1559395] [NEW] Option to clean automatically expired keys

[Sworddragon]

Public bug reported:

I'm using Ubuntu 16.04 dev with apt 1.2.7 and on executing "apt-key
list" I'm sometimes noticing that there are expired keys. I could
removed them manually each but it would be useful if apt-key would
provide an additional argument (for example "clean") that does
automatically delete these keys.

** Affects: apt (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  Option to clean automatically expired keys

Status in apt package in Ubuntu:
  New

Bug description:
  I'm using Ubuntu 16.04 dev with apt 1.2.7 and on executing "apt-key
  list" I'm sometimes noticing that there are expired keys. I could
  removed them manually each but it would be useful if apt-key would
  provide an additional argument (for example "clean") that does
  automatically delete these keys.

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