Fix coredump on 'arp -d'.

Submitted by:	az
Approved by:	re (kib)
Don't use M_WAITOK when running from context where sleeping is prohibited,
such as callout or a geom thread.

Approved by:	re (marius)
Sponsored by:	FreeBSD Foundation
Move local_unbound up in the rc order.

Approved by:	re (blanket)
Prevent resolvconf from updating /etc/resolv.conf.  As Jakob Schlyter
pointed out, having additional nameservers listed in /etc/resolv.conf
can break DNSSEC verification by providing a false positive if unbound
returns SERVFAIL due to an invalid signature.  The downside is that
the domain / search path won't get updated either, but we can live
with that.

Approved by:	re (blanket)
Free both KVA and backing pages when freeing TSS memory.

Reported and tested by:	pho
Sponsored by:	The FreeBSD Foundation
Approved by:	re (marius)
Correcting EXAMPLES section.

Approved by:	re (gjb)
Unbreak the WITHOUT_KERBEROS build and try to reduce the odds of a
repeat performance by introducing a script that runs configure with and
without Kerberos, diffs the result and generates krb5_config.h, which
contains the preprocessor macros that need to be defined in the Kerberos
case and undefined otherwise.

Approved by:	re (marius)
- Add myself as port commiter and my mentors relationship.
- Add myself to calendar.freebsd.

Approved by:	re (gjb), wg (mentor)
Make load average sampling asynchronous to hardclock ticks. This improves
measurement of load caused by time-related events still using hardclock.
For example, without this change dummynet, scheduling events each hardclock
tick, was always miscounted as load of 1.

There is still aliasing with events delayed by the new precision mechanism,
but it probably can't be avoided without moving this sampling from using
callout to some lower-level code or handling it in some other special way.

Reviewed by:	davide
Approved by:	re (marius)
Fix a few instances of M_WAITOK in threads marked as prohibited from sleep,
missed in r255824.

Approved by:	re (kib)
Sponsored by:	FreeBSD Foundation
Don't include the build date or command-line arguments in the binary.

Approved by:	re (blanket)
Regenerate the configure script before running it.
Set the default config file to /var/unbound/unbound.conf.

Approved by:	re (blanket)
Regenerate

Approved by:	re (blanket)
Replace the unused /etc/unbound directory with a symlink to /var/unbound.

Approved by:	re (blanket)
MFC @ 254064
Forgotten in r255825: NETWORKING requires local_unbound.

Approved by:	re (blanket)
Ensure that the ERESTART return from the syscall reloads the
registers, to make the restarted syscall instruction pass the correct
arguments.

PR:	kern/182161
Reported by:	Russ Cox <rsc@swtch.com>
Sponsored by:	The FreeBSD Foundation
MFC after:	3 days
Approved by:	re (marius)
Use the pv lists generation count to read-lock the pvh_global_lock in
pmap_clear_modify().

Noted and reviewed by:	alc
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
Approved by:	re (marius)
Properly ignore PDUs with CmdSN outside of allowed range.

Approved by:	re (glebius)
Sponsored by:	FreeBSD Foundation
In pmap_clear_modify(), initialize pvh even for fictitious managed
page, otherwise the small mappings loop would use uninitialized value.
Note that currently pmap_clear_modify() is not called for fictitious
pages.

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