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)

Fix warnings and set WARNS to 6.

MFC after: 1 week

add cfi test tool

Sponsored by: Carlson Wireless
Reviewed by: imp, Chris Andreson