slapd-null(5) on macOS

The text d990199f4868, as Mac OS X 10.7.5, Mac OS X 10.7.4, Mac OS X 10.7.3, Mac OS X 10.7.2, Mac OS X 10.7.1, Mac OS X 10.7 shipped it.

Null backend to slapd

slapd-null(5) on macOS now