upgrade both planet1001 and planet2001 from jessie to stretch.
This task is for the actual reinstall of the prod instances.
A requirement for that was replacing the planet-venus software with rawdog but this has moved to subtask T180498.
make needed changes in puppet role
also.. replace the whole software since planet-venus doesn't exist in stretch anymore and is largely unmaintained
one candidate is "rawdog" which would be preferred since it's a package in stable
the other is "planet pluto" which is not a package and uses Ruby (gem install...)
rawdog uses Python and Feedparser just like planet-venus did.