[SAC] OSGeo6 will have a dist upgrade today

I plan to upgrade OSGeo6 from Jessie to Stretch later tonight.
While this is happening, there may be periods of outage with mailing lists
and osgeo mail.

I'll send a note just before I start the process and after I am done.

That said, since OSGeo6 holds our mailing lists and is our mail server, I
will not be able to email with any issues during the process.

Any such issues will be announced in OSGeo and OSGeo SAC irc libera
channels (matrix bridges).
I will also announce completion in these channels in addition to the mailing

SAC Team member