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 "Make MPSAFE" to the Coda todo list.

MFC after: 3 days

Remove custom queue macros in Coda, replacing them with queue(9) tailq
macros. The only semantic change was the need to add a vc_opened field
to struct vcomm since we can no longer use the request queue returning
to an uninitialized state to hold whether or not the device is open.

MFC after: 1 month

Remove namecache performance-tuning todo for Coda: we now use the FreeBSD
name cache.

MFC after: 1 month

Forced commit to recognize repo-copy of Coda files from src/sys/coda to
src/sys/fs/coda.

Discussed with: anderson, Jan Harkes <jaharkes@cs.cmu.edu>
Approved by: re (kensmith)
Repo-copy madness: simon

Pass2 complete

Very Preliminary Coda