[Bug 582524] [NEW] Use IMAP CREATE to add folders to IMAP archiver on list creation

Public bug reported:

For every mailing list we expose to IMAP, we'll want to create a few folders. Hook in the IMAP folder creation to the list creation hooks.

** Affects: mailman Importance: High Assignee: Barry Warsaw (barry) Status: Confirmed

** Changed in: mailman Status: New => Confirmed

** Changed in: mailman Importance: Undecided => High

** Changed in: mailman Assignee: (unassigned) => Barry Warsaw (barry)

** Changed in: mailman Milestone: None => 3.0.0a6