Keep old configuration during update

[jlubken]

I've updates the patching scripts in /home/signals/sre on the nfs to:

Specify non-interactive updates.
Keep out config files
Include a copy of new config files from upstream
Also from the monthly patching to clean up dead periodic jobs cluttering the nomad scheduler:

sudo apt install parallel
nomad job status | grep 'periodic-' | awk '{print $1}' -> jobs.txt
cat jobs.txt | parallel -j32 nomad stop -detach -purge

... where 32 is the number of "zombie" tasks to asynchronously attempt to kill off.