[Beowulf] No HTTPS for the mailman interface

[jaquilina at eagleeyet.net]

Hi Guys,

I know Chris is away, but dont you guys feel like there should be an SSL 
certificate on the mailman interface as right now it is sending all 
credentials over http. We can easily get an SSL certificate for free 
through lets encrypt and its very easy to setup on a linux server as 
well as ensure the certificate stays valid as they expire every 90 days.

Let me know what you guys think.