Split opensmtpd-extras into a bunch of slave ports. Right now -extras
only has the table stuff, but there are many more pieces. Having
the default package install postgresql, redis, and mysql when all you
wanted was passwd support, is overkill. Ports for filters will come
soon.
The -extras port retains its OPTIONS (and still installs everything
possible, so there's no disruption for current users).
Approved by: gahr (maintainer)