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

Convert usr.sbin to LIBADD
Reduce overlinking

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

Give a major overhaul to asf(8).

The improvements are:

- can get the kld info from core files via kvm(3);
- can use kldstat(2) directly, which is a piece of cake;
- can use .symbols or whatever, which allows for use by
non-developers when reporting system crashes -- now asf(8)
can be mentioned in the handbook at last;
- speed (no more double fts(3) per loaded module);
- various bugs fixed.

At the same time, the new asf(8) should stay compatible with
the old one, bar bugs. Perhaps some defaults may be changed
later to match today's state of affairs.

Reviewed by: grog
MFC after: 1 month
Sponsored by: RiNet (Cronyx Plus LLC)

Use implicit SRCS list, remove WARNS=0, the code is WARNS=4 clean now,
which is more than enough.

Introducing asf, a helper program for kernel debugging.