import ldns 1.6.13
Resolve issue that caused WITNESS to report LORs.

PR:	kern/171838
Submitted by:	Venkat Duvvuru <venkatduvvuru.ml@gmail.com>
MFC after:	2 weeks
Add option "--unassign-pptdev=<bus/slot/func>" to allow 'bhyvectl' to detach
passthru devices from the guest.

Obtained from:	NetApp
Assert that user address is never qremoved.

No objections from:	alc
MFC after:	1 week
Print slightly more useful information on the 'bad pte' panic.

No objections from:	alc
MFC after:	1 week
FreeBSD uses #if __BSD_VISIBLE to hide non-standard functions, fix this.

Noticed by:	kib
Approved by:	kib
Handle (ignore) when a process disappears before it can be tracked.
Make VM_NDOMAIN a kernel option so that it can be enabled from a kernel
config file.

Requested by:	phk (ages ago)
MFC after:	1 month
Fix date.
Mesh: QoS Control field bit flags fix.

* The following bit flags where incroccetly defined:
    o Mesh Control Present
    o Mesh Power Save Level
    o RSPI
  This is now corrected according to Table 8.4 as per IEEE 802.11 2012;

Approved by:	adrian (mentor)
Eliminate real_LZ4_uncompress.  It's unused and does not perform sufficient
check against input stream (i.e. it could read beyond specified input
buffer).
Change examples to be consistent with what style(9) says.

Approved by:	joel (mentor)
MFC After:	2 weeks
Update fsck_ffs buffer cache manager to use TAILQ macros.
No functional changes.
Fix compilation warning.

Sponsored by:	Nginx, Inc
Finish the r244185. This fixes ever growing counter of pfsync bad
length packets, which was actually harmless.

Note that peers with different version of head/ may grow this
counter, but it is harmless - all pfsync data is processed.

Reported & tested by:	Anton Yuzhaninov <citrin citrin.ru>
Sponsored by:		Nginx, Inc
Remove write only assignments and thus fix the build after struct bufarea
TAILQ conversion (r246812).
setbuf(3): Remove bugs section about ancient versions of BSD.
Add support of passing SCM_BINTIME ancillary data object for PF_LOCAL
sockets.

PR:		kern/175883
Submitted by:	Andrey Simonenko <simon@comsys.ntu-kpi.kiev.ua>
Discussed with:	glebius, phk
MFC after:	2 weeks
Import LDNS and build it as an internal library.
Oops, I flipped LDNS_UTILS but forgot to update the description.