Increase the "memorylocked" limit for the "daemon" class.

amd(8) requires more than the 64MB that is currently available to it so bump
it up to 128MB.

Reviewed by:	kib
Discussed with:	avg, kib, zont
If no resolv.conf has been made for the new system already and the install
media has one already, copy it in lieu of leaving things blank. This
reduces the foot-shooting potential for PXE installs that immediately
add packages.
Add a loader tunable "hw.broken_txfifo" which enables a workaround for a
bug in old versions of QEMU (and Xen, and other places using QEMU code).
On those buggy emulated UARTs, the "TX idle" interrupt gets lost; with
this workaround, we spinwait for the TX to happen and then send ourselves
the interrupt.  It's ugly but it works, while minimizing the impact on
the code for the !broken_txfifo case.

MFC after:	2 weeks
Technical corrections and improvements for the previous change.

Submitted by:	bde
Add new USB ID.

Submitted by:	Ramil
PR:		usb/175639
MFC after:	1 week
Filled in missing pads for AM335x / Beaglebone.

Submitted by:   Emmanuel Vadot <elbarto@megadrive.org>
Fix case for some signal names.

Submitted by:   Emmanuel Vadot <elbarto@megadrive.org>
Configure all GPIO pins as described in Beaglebone SRM.

Submitted by:   Emmanuel Vadot <elbarto@megadrive.org>
Remove some extra and not needed space characters.

MFC after:	1 week
Fix some symbol version mismatches between libstdc++ and libsupc++/libcxxrt
that were causing the runtime and STL libraries to see different versions of
various classes and functions when libstdc++ is used as a filter.

Note: This changes the ABI for libcxxrt, but libcxxrt is currently only in
-STABLE for testing and is not used by anything unless explicitly enabled by
the end user.  No default compiler configurations use it.

libc++ will need to be recompiled after this change.  make buildworld will do
this automatically, but make in lib/libc++ will not necessarily work unless the
new libcxxrt is installed first.

PR:		kern/171610, stand/175453
Reviewed by:	kib
MFC after:	1 week
- Style.

MFC after:	2 weeks
- Add sysctls to show number of stats scans.

MFC after:	2 weeks
- Add system wide page faults requiring I/O counter.

Reviewed by:	alc
MFC after:	2 weeks
- Show page faults requiring I/O on vmstat display.

Reviewed by:	alc
MFC after:	2 weeks
- Show page faults requiring I/O when -s invoked.

Reviewed by:	alc
MFC after:	2 weeks