Log Message:
misc/py-anita: update to 2.8

Changes from 2.7:

Preemeptively support sysinst requesting entropy as a single line.

Fix bug in 2.7 that caused the provision of entropy to the installer
to fail when running under Python 3.

Omit ",cdrom" when passing a CD-ROM device to a Xen PV domain because
doing so will cause NetBSD/Xen to ignore device since xenbus_probe.c
1.51.