MFC r298881, 298882, 298883, 298885:

Minor spelling fixes in:
tools, share, bluetooth, pmcstat, etc

Many of these have user-visible strings.

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

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

Teach btpand(8) to recognized Bluetooth device node names.

Tested by: Daniel O'Connor <doconnor -at- gsoft -dot- com -dot- au>
MFC after: 3 days

Fix client mode. Pick up service availability changes.

Obtained from: NetBSD
MFC after: 1 month

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