Copy stable/11@r303970 to releng/11.0 as part of the 11.0-RELEASE
cycle.

Prune svn:mergeinfo from the new branch, and rename it to RC1.

Update __FreeBSD_version.

Use the quarterly branch for the default FreeBSD.conf pkg(8) repo and
the dvd1.iso packages population.

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

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 META_MODE support.

Off by default, build behaves normally.
WITH_META_MODE we get auto objdir creation, the ability to
start build from anywhere in the tree.

Still need to add real targets under targets/ to build packages.

Differential Revision: D2796
Reviewed by: brooks imp

The last big commit: let usr.sbin/ use WARNS=6 by default.

Catch up with the import of bsnmp-1.11. Add a couple of new
configuration flags to CFLAGS.

Let bsd.prog.mk set SRCS and MAN to their default values.

Correct the include path so that the include files are found
with include "...".

Add the build infrastructure for the SNMP daemon that is the base
for the NgATM ILMI daemon and for the tree parsing helper program.