Use "file -s", so that we can run vmrun.sh against special devices such
as /dev/md memory file systems

Reviewed by: neel
Add XL710 device entries to NOTES, and directories to the module
Makefile so they will be built.

MFC after: 1 day
In r253839 the default behaviour of ld(1) was changed such that all
libraries that need to be linked into an executable or library have to be
listed on the command line explicitly.  This commit fixes a bug in ld(1)
where it would scan dependencies of the libraries on the command line and
link them if needed if they were also found in ld.so.cache.

The important bit of the patch is the initialisation of needed.by such that
libraries found by scanning dependencies are marked as such and not used in
the link.

The patch is a backport of binutils git commit
d5c8b1f8561426b41aa5330ed60f578178fe6be2

The author gave permission to use it under GPLv2 terms.

PR:		192062
Exp-run by:	antoine
MFC after:	1 week
Fix build breakage caused by ixl driver

Fix missing includes and invalid vars in ixl / ixlv driver added by r270346
which caused build failures for GENERIC kernel after it was made default
by r270755.

X-MFC-With: r270346 / r270755
Sponsored by:	Multiplay
Refactor ZFS ARC reclaim logic to be more VM cooperative

Prior to this change we triggered ARC reclaim when kmem usage passed 3/4
of the total available, as indicated by vmem_size(kmem_arena, VMEM_ALLOC).

This could lead large amounts of unused RAM e.g. on a 192GB machine with
ARC the only major RAM consumer, 40GB of RAM would remain unused.

The old method has also been seen to result in extreme RAM usage under
certain loads, causing poor performance and stalls.

We now trigger ARC reclaim when the number of free pages drops below the
value defined by the new sysctl vfs.zfs.arc_free_target, which defaults
to the value of vm.v_free_target.

Credit to Karl Denninger for the original patch on which this update was
based.

PR:		191510 and 187594
Tested by:	dteske
MFC after:	1 week
Relnotes:	yes
Sponsored by:	Multiplay
Add canonical population of a disk / thumb drive from an image
example.
Some corrections, reformating, and additional info about the VF
driver in the README.

MFC after: 1 day
Remove the DEV_NETMAP code from the ixl drivers, it was a placeholder
and not yet ready to be defined, and its causing build errors.

MFC after:	3 days
Add Alonso Schaich to ports developers. Mentors: makc@, rakuco@

Approved by:	rakuco (mentor)
Fix the NOINET and NOINET6 builds.

MFC after:3 days
Fix rc.d/gssd script to define the default values in a standard way.
- Add a warning message when an IPv6 address is specified with no prefixlen.
- Use a parameter argument in jls(8) instead of doing grep.
Restructure rc.d scripts for kerberos5 daemons:

- Rename $kerberos5_server_enable with $kdc_enable and rename
  rc.d/kerberos with rc.d/kdc.

- Rename $kadmin5_server_enable with $kadmind_enable.

- Rename ${kerberos5,kpasswdd}_server with ${kdc,kpasswdd}_program.

- Fix rc.d/{kadmind,kerberos,kpasswdd,kfd} scripts not to change variables
  after load_rc_config().

- Add rc.d/ipropd_master and rc.d/ipropd_slave scripts.  These are
  for iprop-master(8) and iprop-slave(8).  Keytab used for iprop service is
  defined in ipropd_{master,slave}_keytab (/etc/krb5.keytab by default).

- Add dependency on rc.d/kdc to SERVERS.  rc.d/kdc must be invoked as early
  as possible before scripts divided by rc.d/SERVERS.

Note that changes to rc.d/{kdc,kpasswdd,kadmind} are backward-compatible
with the old configuration variables:
${kerberos5,kpasswdd,kadmin5}_server{,_enable,_flags}.
Return false status only when adding a route is failed.  It could
erroneously return false due to an afexists() check loop in routing_start().
vt(4): Change vb_history_size from "int" to "unsigned int"

CID:		1230002, 1230003
MFC after:	1 week
vt(4): Indicate that KDSETRAD case falls through the next case

CID:		1229953
MFC after:	1 week
Add function and wrapper to switch lockmgr and vnode lock back to
auto-promotion of shared to exclusive.

Tested by:	hrs, pho
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Direct access to the quota files, in particular, lookup, causes lock
conflict with the quota metadata access.  Mark quota vnode lock as
recursive and always exclusive to avoid the problem.

Reported by:	hrs
Tested by:	hrs, pho
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
IFUNC symbol type shall be processed for non-PLT relocations,
e.g. when a global variable is initialized with a pointer to ifunc.
Add symbol type check and call resolver for STT_GNU_IFUNC symbol types
when processing non-PLT relocations, but only after non-IFUNC
relocations are done.  The two-phase proceessing is required since
resolvers may reference other symbols, which must be ready to use when
resolver calls are done.

Restructure reloc_non_plt() on x86 to call find_symdef() and handle
IFUNC in single place.

For non-x86 reloc_non_plt(), check for call for IFUNC relocation and
do nothing, to avoid processing relocs twice.

PR:	193048
Sponsored by:	The FreeBSD Foundation
MFC after:	2 weeks
First try on fixing some more compile errors without actually testing:
- use proper __FreeBSD_version check and more importantly check for __am64__
  to be defined.  Whether the FreeBSD(_version) checks are needed is a
  different question.
- cast uint64_t to uintmax_t and use %jx for printing.

Note: there are more values that could be printed in that status function
	but leave that for the future;  printf doesn't seem to be the right
	way to do it anyway.
Note: there is more breakage related to i40e_allocate_dma*() having
	conflicting declarations, so more fixes to come.

PR:		193112
MFC after:	3 days
X-MFC with:	r270755