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

Drop <bsd.man.mk> support from <bsd.kmod.mk>.

Not objected to by: -current

Use a consistent style and one much closer to the rest of /usr/src

When manual pages are moved or removed, MANX should be changed
to NOMAN.

Reported by: bde

Move the netgraph-related manual pages into share/man/man4/, as
discussed with archie.

Use .include <bsd.kmod.mk> to get to ../../*/conf/kmod.mk instead of
encoding the relative path.

AUTHOR -> AUTHORS

Document the new statistics control messages.
Add a note about the IP header asymmetry on the "lower" hook.

Move netgraph node type man pages from section 8 to section 4.

Pull in sys/conf/kmod.mk, rather than /usr/share/mk/bsd.kmod.mk.
This means that the kernel can be totally self contained now and is not
dependent on the last buildworld to update /usr/share/mk. This might
also make it easier to build 5.x kernels on 4.0 boxes etc, assuming
gensetdefs and config(8) are updated.

Zap KMODDEPS line

Correct man page title.

Manual page style work.
Submitted by: Alexey Zelkin <phantom@FreeBSD.org>
thanks!

Add reference to RFC 1702, after learning how to have "T. Li"
as an author without nroff blowing up.

Problem solved by: fenner

New netgraph node type 'pptpgre': this performs GRE encapsulation
for the PPTP protocol as specified in RFC 2637.