MFC r254132:
  Add empty zones for Shared Address Space (RFC 6598)

Approved by:  delphij (mentor)
Sponsored by: DK Hostmaster A/S
Merge r254263:

Update PCI drivers to no longer look at the MEMIO-enabled bit in the PCI
command register.  The lazy BAR allocation code in FreeBSD sometimes
disables this bit when it detects a range conflict, and will re-enable
it on demand when a driver allocates the BAR.  Thus, the bit is no longer
a reliable indication of capability, and should not be checked.  This
results in the elimination of a lot of code from drivers, and also gives
the opportunity to simplify a lot of drivers to use a helper API to set
the busmaster enable bit.

This changes fixes some recent reports of disk controllers and their
associated drives/enclosures disappearing during boot.

Candidate for 9.2

Submitted by:	jhb
Reviewed by:	jfv, marius, adrian, achim
MFC r254020:
Add a missing module version declaration to if_tun(4).
MFC r254017:
Fill in the description fields for M_FICT_PAGES.
MFC r253850:
Properly print arguments to vfork(2) and rfork(2).
MFC r254237:
Add optional support for default override of standard setup; but only if
corresponding functions are provided. If override function does not exist,
boot remains unmodified. This patch should not result in any changes.
MFC r253853:
  Include /usr/local/etc/libmap.d/ by default.

  PR:             180568
  Reviewed by:    bapt
  Obtained from:  kib
MFC r253986:
  Fix formatting warning.
MFC: Temporarily revert sendmail 8.14.7 change to getipnodebyname() flags
     to prevent problems between the resolver and Microsoft DNS servers with
     AAAA lookups.  The upstream open source project will work on a more
     permanent fix for the next release.  Issue noted by Pavel Timofeev.
MFC r254338:
Don't send uninitialized memory (two instances of 4 bytes) in
every cookie on the wire. This bug was reported in
https://bugzilla.mozilla.org/show_bug.cgi?id=905080
MFC: r254091

According to POSIX \ in the fnmatch(3) pattern should escape
any character including '\0', but our version replace escaped '\0'
with '\\'.
I.e. fnmatch("\\", "\\", 0) should not match while fnmatch("\\", "", 0)
should (Linux and NetBSD does the same). Was vice versa.

PR:     181129
Merge remote-tracking branch 'upstream/stable/9' into stable/9
Merge branch 'stable/9' into stable-9-atf