Use EXAMPLES properly

Now you don't have to install them if you don't want them. This include
these directorys:

/var/db/acme/.acme.sh/deploy
/var/db/acme/.acme.sh/dnsapi
/var/db/acme/.acme.sh/notify

Reported by: mat
Reviewed by: sunpoet
Differential Revision: https://reviews.freebsd.org/D23209