Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Add btpand(8) daemon from NetBSD. This daemon provides support for
Bluetooth Network Access Point (NAP), Group Ad-hoc Network (GN) and
Personal Area Network User (PANU) profiles.

Obtained from: NetBSD
MFC after: 1 month