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

[OSGeo]

#2174: Upgrade Mailman version to recent 2.1.27 release
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 Reporter:  Jeff McKenna   |      Owner:  sac@…
     Type:  task           |     Status:  new
 Priority:  normal         |  Milestone:
Component:  Systems Admin  |   Keywords:
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 - currently running 2.1.10 (released in 2015) on osgeo6
  - upgrade will help us with a few tickets (such as #2123)
  - recent changes https://launchpad.net/mailman/+milestone/2.1.27
  - download http://ftp.gnu.org/gnu/mailman/

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