[Bug 1039175] [NEW] use new archive_policy property everywhere

[AlexanderS]

Public bug reported:

At some points the old properties MailingList.archive and
MailingList.archive_private are used. This patch use the new
archive_policy.

** Affects: mailman
     Importance: Undecided
         Status: New


** Tags: mailman3

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https://bugs.launchpad.net/bugs/1039175

Title:
  use new archive_policy property everywhere

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