base: puppet cleanups

- Do not provision a custom /etc/init.d/puppet nor a
  /etc/default/puppet. The latter is deprecated and not checked from the
  (default) init script nor from its systemd unit that replaces it.

  The current files were useless (and a bit crazy) anyway, as the init
  script we were provisioning was adding "default" support and then we
  were shipping a default file that said START=yes, despite us wanting
  the exact opposite behavior (as we run puppet from cron).

  Remove all that and rely on the fact that we are already setting the
  puppet Service to ensure => stopped, enable => false.

- Remove the File['/var/log/puppet.log'] stanza that exists to set
  permissions there. It was wrong to do this here in the first place and
  we since puppet-run, we are handling it properly by using umask.

- Remove Package['coreutils'] from base::puppet and move it to
  base::standard-packages instead.

Change-Id: I7cd0c2406235163cec77e508572d1e48ebbf92ef