[SAC] [OSGeo] #2174: Upgrade Mailman version to recent 2.1.27 release

[OSGeo]

#2174: Upgrade Mailman version to recent 2.1.27 release
---------------------------+----------------------------------------
 Reporter:  Jeff McKenna   |       Owner:  strk
     Type:  task           |      Status:  assigned
 Priority:  normal         |   Milestone:  Sysadmin Contract 2020-II
Component:  Systems Admin  |  Resolution:
 Keywords:  mailman        |
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Changes (by neteler):

 * keywords:   => mailman


Comment:

 No idea why this was done (and I cannot imagine a reason). I scanned the
 old "mailman" tickets:
 https://trac.osgeo.org/osgeo/query?status=assigned&status=closed&status=new&status=reopened&keywords=~mailman&order=priority

 (seems Martin S was involved after Frank W, e.g. #1577)

 Anyway, I'd suggest to change to a standard apt repo setup.

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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2174#comment:4>
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