MFC r239046:

Fix typo.

PR:	kern/177495
MFC r249241:

Fix synopsis for sbuf_len.
MFC r245525:

  Add a conditional sleep 1 in case we add any IPv6 addresses to interfaces.
  Do this per jail started, not per address.  This will allow DAD to complete
  and services to properly start.   Before we have seen problems with services
  trying to start before the IPv6 address was available to use and thus
  erroring and failing to start.
MFC r232385 by ru: Remove 3 syscalls from opendir().

Finally removed the stat() and fstat() calls from the opendir() code.
They were made excessive in r205424 by opening with O_DIRECTORY.
Also eliminated the fcntl() call used to set FD_CLOEXEC by opening
with O_CLOEXEC.

(fdopendir() still checks that the passed descriptor is a directory,
and sets FD_CLOEXEC on it.)

The necessary kernel support for O_DIRECTORY and O_CLOEXEC was already in
9.0-RELEASE.

Discussed with:	ru
MFC r249163:
If filter of the interrupt event is not null, print it, in addition to
the handler address.  Add a mark to distinguish between filter and
handler.
MFC r249161:
Following r241022, replace iteration over the provider list on media events
by taking first one and asserting that there is no others.
Merge remote-tracking branch 'upstream/stable/9' into stable/9