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)

/* -> /*- for license, minor formatting changes

Mechanically rename s/ng_timeout/ng_callout/g, s/ng_untimeout/ng_uncallout/g.
This is done to keep both versions in RELENG_5 and support both APIs.

Reviewed by: scottl
Approved by: julian (mentor), implicitly

Cancel pending timeout before scheduling a new one. This fixes
item leak, I've introduced with previous change.

Approved by: julian (mentor)

Adapt to the new ng_timeout/ng_untimeout arguments. These now use
the callout instead of the timeout interface.

Submitted by: glebius

Netgraph part of the NgATM signalling AA layer. These nodes can
also be used as a general-purpose transport protocol above any
packet layer (IP, UDP).