Regenerate certificate on each installation.

[Matthiman]

Hello, I use the dev-branch version and for about 10 days when I launch the installer each time in the middle of the installation there is this message and my client workstations are no longer authenticated…

This run will mint a new FOG PKI CA. A CA's name constraints are
  fixed at the moment it's issued -- widening them later means
  re-issuing it (rm -rf the CA directory, then re-run).
  Extra hostnames for this server, space-separated (3 min, blank = none):
  Internal domains, space-separated, e.g. example.local (3 min, blank = none):