Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

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

Add ALTQ(9) support for the CoDel algorithm.

CoDel is a parameterless queue discipline that handles variable bandwidth
and RTT.

It can be used as the single queue discipline on an interface or as a sub
discipline of existing queue disciplines such as PRIQ, CBQ, HFSC, FAIRQ.

Differential Revision: https://reviews.freebsd.org/D3272
Reviewd by: rpaulo, gnn (previous version)
Obtained from: pfSense
Sponsored by: Rubicon Communications (Netgate)

ALTQ FAIRQ discipline import from DragonFLY

Differential Revision: https://reviews.freebsd.org/D2847
Reviewed by: glebius, wblock(manpage)
Approved by: gnn(mentor)
Obtained from: pfSense
Sponsored by: Netgate

- 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@

FreeBSD-ify ALTQ:
- add locking
- disable ALTQ3_COMPAT by default (do not remove the code to keep the diff
towards KAME small)
- put some more code under ALTQ3 conditional compilation as it should be
- account for if_xname
- some more minor compile fixes

As people started wondering:
The strange path layout "altq/altq" is there to avoid "-Isys/contrib" and
make it "-Isys/contrib/altq" instead, as we will need at least <altq/altq.h>
and <altq/if_altq.h> for kernel compilation.

The "freebsd4_..." in the privious commit is just the best tag name in the
KAME tree I could find to classify this in order to track its history. It
does *not* mean that this will go to 4-STABLE or anything of that kind.

This commit was generated by cvs2svn to compensate for changes in r130365,
which included commits to RCS files with non-trunk default branches.

Import parts of the ALTQ framework from latest KAME snapshot (which is up to
HEAD at this point). This will not exactly live in a vendor branch, but have
the vendor backing to make it easier to exchange diffs.

This will be followed by a diff which takes most of the .c files off the
vendor branch in order to:
- add locking
- disable ALTQ3_COMPAT code (which is outdated and "un-lockable")

There is work in progress to refine the configuration API. Import this "as
is" now to have more exposure time before 5-STABLE.

This is only the import, it will be some more days until you will actually
be able to compile ALTQ support into your kernel so don't hold your breath.
HEADUPs will be posted on current@ and net@ before this is actually enabled.

No-objection: re(scottl), core(rwatson)