MFC r272105: Remove duplicated header content

Approved by:	re (gjb, kib)
MFC r271875, r272046, r272049, r272056
 -> Reference the test case "packs" to fix warnings
 -> Delete mentions to removed manpages
 -> Minor fixes to docs

Approved by: re (gjb)
MFC r271549 (nwhitehorn):

    Create /tmp/bsdinstall_etc even if we aren't starting the installer
    so that dhclient can write resolv.conf when used from the live
    environment.

PR:		176078
Approved by:	re
MFC 271745,271834,271899,271900,271913,272022,272023:

  Revert changes to shared code of the ixl and ixlv drivers to allow
  for easier long-term maintainability.

  Restrict the drivers to building on amd64 for now as it is
  only tested on that 64bit architecture.

  Just depend on PCI and neither INET nor INET6; also make sure we
  can build individual drivers and they do not depend on each other
  anymore.

  Reviewed by:	gnn, eric.joyner intel.com
PR:		193824
Approved by:	re (gjb)
MFC r271493,271688-271689,271696,271854,272139-272143:

Import HyperV Key-Value Pair (KVP) driver and daemon code by Microsoft,
many thanks for their continued support of FreeBSD.

While I'm there, also implement a new build knob, WITHOUT_HYPERV to
disable building and installing of the HyperV utilities when necessary.

The HyperV utilities are only built for i386 and amd64 targets.

Approved by:	re (gjb)
MFC the altera_atse.4.

This was intended to have been merged along with r256752.  This commit
contains the altera_atse.4 portions of r256752, r257656, and r270268.

Approved by:	re (gjb)
Sponsored by:	DARPA/AFRL
MFC r271526: MFV r271510:

Enforce 4K as smallest indirect block size (previously the smallest
indirect block size was 1K but that was never used).

This makes some space estimates more accurate and uses less memory
for some data structures.

Illumos issue:
    5141 zfs minimum indirect block size is 4K

Approved by:	re (gjb)
MFH (r272280, r272281, r272348): allow use with null user and rhost

PR:		83099 193927
Approved by:	re (kib)
MFC r268376 (imp):

  rm -rf can fail sometimes with an error from fts_read. Make it
  honor fflag to ignore fts_read errors, but stop deleting from
  that directory because no further progress can be made.

  When building a kernel with a high -j value on a high core count
  machine, during the cleanobj phase we can wind up doing multiple
  rm -rf at the same time for modules that have subdirectories. This
  exposed this race (sometimes) as fts_read can return an error if
  the directory is removed by another rm -rf. Since the intent of
  the -f flag was to ignore errors, even if this was a bug in
  fts_read, we should ignore the error like we've been instructed
  to do.

Approved by:	re (kib)
Sponsored by:	The FreeBSD Foundation
MFC r272193

  Allow the PIC's IMR register to be read before ICW initialisation.

  As of git submit e179f6914152eca9, the Linux kernel does a simple
  probe of the PIC by writing a pattern to the IMR and then reading it
  back, prior to the init sequence of ICW words.

  The bhyve PIC emulation wasn't allowing the IMR to be read until
  the ICW sequence was complete. This limitation isn't required so
  relax the test.

  With this change, Linux kernels 3.15-rc2 and later won't hang
  on boot when calibrating the local APIC.

Approved by: re (gjb)
MFC r272027:

Hardware driver update from Mellanox Technologies, including:
 - improved performance
 - better stability
 - new features
 - bugfixes

Supported HCAs:
 - ConnectX-2
 - ConnectX-3
 - ConnectX-3 Pro

NOTE:
  - TSO feature needs r271946, which is not yet merged.

Sponsored by:	Mellanox Technologies
Approved by:	re, glebius
MFC r272253:

Regenerate usb.conf

Approved by:    re, gjb
MFC r272254:
Instead of creating the full range of possible ports, try to figure
out the actual number of so-called "embedded jacks" which are present
when a USB MIDI device is attaching.

Approved by: re, gjb
MFC r272274:
Change the /var dataset in the default ZFS layout to have the
ZFS property canmount=off, making /var/db/pkg part of the / dataset, so
installed package files are consistent with the package database when
using ZFS boot environments (beadm).

PR:		193971
Reviewed by:	Shawn Webb, bcr
Approved by:	re (gjb), jmg
Relnotes:	yes
Sponsored by:	ScaleEngine Inc.
MFC r272389:

Diff reduction with kernel code: instruct the compiler that the data of
these types may be unaligned to their "normal" alignment and exercise
caution when accessing them.

PR:		194071
Approved by:	re (gjb)
MFC r270183:

  Avoid showing stale errors when nmount(2) fails.

  This should not be documented in relnotes as it still fails due to a
  race with unmounting, but no longer shows bogus details.

Approved by:	re (gjb)
MFC r271321:

  Don't cross mount boundaries when cleaning tmp files.

Approved by:	re (gjb)
Relnotes:	yes
MFC r272028:

  Make it more explicitly clear that -t will not change filename.

Approved by:	re (gjb)
MFC r271720:

  If fgets(3) fails in getbounds(), show strerror(3) if not an EOF. Also fix a
  FILE* leak in getbounds().

PR:		192032
Approved by:	re (gjb)
MFC r272288,272289:

When setting environment variables in the atrun script, use the
"export foo=bar" form instead of "foo=bar; export foo" since the
former allows the shell to catch variable names that are not valid
shell identifiers.  This will cause /bin/sh to exit with an error
(which gets mailed to the at user) and it will not run the script.

Obtained from:	OpenBSD (r1.63 millert)
Approved by:	re (gjb)