Use m_get2() instead of m_getcl().

Spotted by:	glebius
sync with our internal repo - small change in debugging messages
Fix netmap emulation when NICs attached to a VALE switch have a different
number of tx and rx rings

Submitted by:	Vincenzo Maffione
Remove not applicable PI_SDTR_ABLE and PI_WIDE_16 hba_inquiry flags to
make CAM to not try negotiate unsupported settings and suppress warnings.

While there, enable command queuing on pass-through devices, announced
in hba_inquiry, but disabled.  Even though queue size is very small, It
seems working well enough.

Reviewed by:	scottl
MFC after:	2 weeks
Add the manual page for geom_uncompress(4).

Approved by:	adrian (mentor)
Build the geom_uncompress(4) module by default.

Fix geom_uncompress(4) module loading.  Don't link zlib.c (which is a module
itself) directly.

The built module was verified and used to read a few mkulzma(8) images on
amd64 to validate some of the informations on the manual page.

While here, don't overwrite CFLAGS.

Reviewed by:	ray
Approved by:	adrian (mentor)
Add -4/-6 shorthand for -finet/-finet6 in route(8) and netstat(8).

MFC after:	2 weeks
Respect the original layout of the atf-{c,c++} tests.

Put test programs for internal modules into a 'detail' subdirectory of the
libatf-c and libatf-c++ test directories, just as the upstream distribution
does.  This is necessary because the tests assume such layout to find the
process_helper program, and currently fail because of this divergence.

MFC after:	1 week
Fix path to the process_helpers for the libatf-c++ tests.

Because we respect the FreeBSD src tree layout under /usr/tests, and because
the layout of the tests in the atf distfile does not match the former, the
tests for atf-c++ were not able to find the process_helper binary.

Fix this by explicitly hardcoding the right path in the FreeBSD test suite.

Obtained from:	atf (git 1f0e878f7f127741a3762883ef24aef317e239d5)
MFC after:	1 week
use explicit casts with void* to compile when included by C++ code
Enable the "Acknowledge Interrupt on VM exit" VM-exit control.

This control is needed to enable "Posted Interrupts" and is present in all
the Intel VT-x implementations supported by bhyve so enable it as the default.

With this VM-exit control enabled the processor will acknowledge the APIC and
store the vector number in the "VM-Exit Interruption Information" field. We
now call the interrupt handler "by hand" through the IDT entry associated
with the vector.
Enable "Posted Interrupt Processing" if supported by the CPU. This lets us
inject interrupts into the guest without causing a VM-exit.

This feature can be disabled by setting the tunable "hw.vmm.vmx.use_apic_pir"
to "0".

The following sysctls provide information about this feature:
- hw.vmm.vmx.posted_interrupts (0 if disabled, 1 if enabled)
- hw.vmm.vmx.posted_interrupt_vector (vector number used for vcpu notification)

Tested on a Intel Xeon E5-2620v2 courtesy of Allan Jude at ScaleEngine.
[automated] Merge in upstream-github/master