sys: Remove $FreeBSD$: one-line .h pattern

Remove /^\s*\*+\s*\$FreeBSD\$.*$\n/

altq: ansify

Sponsored by: Rubicon Communications, LLC ("Netgate")

net: clean up empty lines in .c and .h files

altq: remove ALTQ3_COMPAT code

This code has apparently never compiled on FreeBSD since its
introduction in 2004 (r130365). It has certainly not compiled
since 2006, when r164033 added #elsif [sic] preprocessor directives.
The code was left in the tree to reduce the diff from upstream (KAME).
Since that upstream is no longer relevant, remove the long-dead code.

This commit is the direct result of:

unifdef -m -UALTQ3_COMPAT sys/net/altq/*

A later commit will do some manual cleanup.

I do not plan to MFC this. If that would help you, go for it.

sys/net*: minor spelling fixes.

No functional change.

- Format copyright notices, VCS ids.
- Run through unifdef(1).

Move ALTQ from contrib to net/altq. The ALTQ code is for many years
discontinued by its initial authors. In FreeBSD the code was already
slightly edited during the pf(4) SMP project. It is about to be edited
more in the projects/ifnet. Moving out of contrib also allows to remove
several hacks to the make glue.

Reviewed by: net@