security/acme.sh: Fix up some install issues

Don't install cronjob to /usr/local/etc/cron.d/
There is no concept of sample files in this directory. Everything is active.
Instead, install to /usr/local/share/examples/acme.sh and let the user
copy it over.

In the cronjob itself, specify the acme user. This was previously omitted
and the job would not run.

Install the sample newsyslog file to /usr/local/etc/newsyslog.conf.d - this
was installing to /usr/local/etc/newsyslog.d/acme.sh

Add an update cluse to pkg-message mentioning the newsyslog issue.

None of these changes should break existing installs.