Vendor import of OpenSSH 6.3p1
Fix the AR933x CPU UART support by using the correct clock when calculating
the UART frequency.

Tested:

* AR933x (carambola 2 board), UART now works again

Approved by:	re
Make the directory mapping functionality, which was previously only
available in 32-bit compatibility mode, unconditional.

Overhaul the man page, which had evolved more by accretion than by design.

Approved by:	re (gjb)
MFC after:	3 weeks
Ditch the random seeding code, which never really worked as intended.
Add config variables to enable / disable individual host key algorithms.
Clean up the host key generation code.

Approved by:	re (gjb)
MFC after:	3 weeks
Upgrade to 6.3p1.

Approved by:	re (gjb)
Stability fixes for Intel LynxPoint XHCI controllers. Disable XHCI port
routing if we get certain errors. Poll for command completion upon
command timeouts. The XHCI error events might not generate interrupts.

MFC after:	1 week
Reported by:	Daniel Gerzo <danger@rulez.sk>, Antonis Anastasiadis <anastasiadis@datalive.gr>
PR:		usb/181159
Approved by:	re (gjb)
Pull in all the OpenSSH bits that we'd previously left out because we
didn't use them.  This will make future merges from the vendor tree much
easier.

Approved by:	re (gjb)
Create a separate script to generate osreldate.h rather than sourcing
newvers.sh into a temporary subshell with inline make rules.

Using a separate script fixes a variety of problems, including establishing
the correct dependencies in the makefiles.  It also eliminates a problem
with the way newvers.sh uses `realpath $0`, because $0 expands differently
within a script sourced into a rule in a makefile depending on the version
of make and of /bin/sh being used.  The latter can cause build breakage in a
cross-build environment, and can also make it difficult to compile 10.0 on
older pre-10.0 systems.

PR:		160646 174422
Submitted by:	Garrett Cooper <yaneurabeya@gmail.com>
Approved by:	re (gjb)
MFC after:	2 weeks
Give argtype struct names a different prefix than probe struct names.
Otherwise it's possible to declare SDT probes in such a way that a name
collision occurs, causing an unexpected compilation error.

Approved by:	re (gjb)
MFC after:	1 week
Omit "__restrict" when generating syscall argument strings. DTrace doesn't
handle it and cannot determine the argument type when it's present.

Approved by:	re (gjb)
MFC after:	1 week
Regenerate syscall argument strings after r255777.

Approved by:	re (gjb)
MFC after:	1 week
Set props and correct RCS ID tag.

Approved by:	re (blanket)
Remove autoprops.

Approved by:	re (blanket)
Fix compilation of the i386 PAE kernel config.

sys/i386/include/xen/xenvar.h:
	Provide vtomach() when PAE is defined.

Approved by:	re (blanket Xen)
Fix ia64 and mips kernel builds due to XENHVM=>GENERIC integration in
revision 255744.

sys/kern/subr_smp.c:
	IPI_SUSPEND is only available on amd64 and i386.  Protect
	new uses of this constant with #ifdefs to avoid impacting
	other platforms.

Approved by:	re (blanket Xen)
Remove the armv6eb architecture as it is unused, and almost certainly
broken. None of our kernels can boot armv6eb. The little-endian kernels do
not have the required code to be able to switch endian when running a
big-endian executable.

Approved by:	re (gjb)
- Create kern.ipc.sendfile namespace, and put the new "readhead" OID
  there as "kern.ipc.sendfile.readahead".
- Push all nsfbuf related tunables into MD code. Don't move them
  to new namespace in favor of POLA.

Reviewed by:	scottl
Approved by:	re (gjb)
Consistently use the same value to indicate exclusively-held and
shared-held locks for all the primitives in lc_lock/lc_unlock routines.
This fixes the problems introduced in r255747, which indeed introduced an
inversion in the logic.

Reported by:	many
Tested by:	bdrewery, pho, lme, Adam McDougall, O. Hartmann
Approved by:	re (glebius)
Update comment from draft to RFC number.

Submitted by:	Loganaden Velvindron (logan elandsys.com)
Approved by:	re (gjb)
MFC after:	6 days
Both the vm_map and vmspace zones are defined as "no free".  So, there is no
point in defining a fini function for these zones.

Reviewed by:	kib
Approved by:	re (glebius)
Sponsored by:	EMC / Isilon Storage Division