This simplifies the procedure to debug.

This key has a short expiration period which becomes impractical check expiration date all the run, so
I am removing and reading later the key as upgrade happens once a month.

  Install lm-sensors in order to measure hardware temperature on re6st
  Don't upgrade kernel for now until the procedure is well defined and working
  Invoke re6stnet role for update it's configuration

/reviewed-on nexedi/slapos.package!20