fsirand does not actually use libutil
Create a directory for the PAM tests.
Convert to use libxo.

Obtained from:  Phil Shafer <phil@juniper.net>
Sponsored by:   Juniper Networks, Inc.
Document that w(1) supports libxo(3).
Add to CTL support for logical block provisioning threshold notifications.

For ZVOL-backed LUNs this allows to inform initiators if storage's used or
available spaces get above/below the configured thresholds.

MFC after:	2 weeks
Sponsored by:	iXsystems, Inc.
Upon second-thought (following r274144), remove spurious (unused)
line-noise (libdialog never lived in lib/ -- but rather the noise
came from translating a comment that was introduced 16 years ago
via r40306; translation from comment to code occurred via r267511).

MFC after:	3 days
Reviewed by:	ngie
X-MFC-to:	stable/10
Bump __FreeBSD_version after SA-14:23, SA-14:24,
SA-14:25.

Approved by:	re (implicit)
Sponsored by:	The FreeBSD Foundation
Add include missed in r274154, breaking the buildworld.