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

Updates for netgraph node manual pages.

Discussed with: glebius
Submitted by: Mamontov Roman <mr.xanto@gmail.com>

Markup fixes.

Submitted by: ru

Document the new {set,get}{timestamp,counter} messages supported by the
ng_source node. Also remove an obsolete email address.

Sponsored by: Sandvine Incorporated

Clarify that the input hook requires binary packet data. Instead of
referencing an omitted example, include a short (Perl) example that
queues an ICMP Echo message.

Implement an upper limit for packets per second sent by node.

Assorted markup fixes and minor wordsmithing.

Approved by: re

- Update and expand description of node operation.
- Cut section IMPLELEMENTATION NOTES. It doesn't apply to
modern FreeBSD.

Sponsored by: Rambler

Verify that SYNOPSIS section compiles.

Sort sections.

(fast) ethernet -> (Fast) Ethernet

MFC after: 3 days

mdoc(7): Use the new feature of the .In macro.

mdoc(7) police: overhaul.

Approved by: re

More formatting fixes

Slight formatting change.

Add the netgraph 'source' module.
This is NOT YET CONVERTED TO -current.
This node is a source for preprogrammed packets at a known rate for testing.

I will convert it to -current "in place" but will MFC teh original
pre-conversion variant as that is what is originally submitted.
Man page my me, info from Dave's README.

Submitted by: Dave Chapeskie <dchapeskie@SANDVINE.com>
Obtained from: Sandvine inc.
MFC after: 1 week