[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  |  Resolution:
 Keywords:                 |
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Description changed by Jeff McKenna:

Old description:

> - 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/

New description:

 - currently running 2.1.20 (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#comment:1>
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