Revert r274635 as it's completely wrong.
The parent of a pci dev device is a pciX device which do not
implement the PCIB_POWER_FOR_SLEEP method from pcib_if.m.
Fix build without INVARIANTS, broken by r274675.
pf(4) needs to have a correct checksum during its processing.
Calculate checksums for the IPv6 path when needed before
delving into pf(4) code as required.

PR:     172648, 179392
Reviewed by:    glebius@
Approved by:    gnn@
Obtained from:  pfSense
MFC after:      1 week
Sponsored by:   Netgate
Expose groups by default in ifconfig output. This was never hidden by
OpenBSD; unsure why we chose to do so. As groups are a requirement for
pf, exposing them by default will make our pf implementation less
confusing.

While here add a missing free() that OpenBSD fixed 7 years ago.

PR:		194925
Differential Revision:	https://reviews.freebsd.org/D1185
Approved by:	des
Obtained from:	OpenBSD
Stop using early_putc immediately after configuring console with cninit()

Early UART should be released right after system console initialization is
completed. Otherwise, after cninit() both early and system console coexist
what may lead to various issues (i.a. writing to unmapped early
UART address). This cannot be done in cninit_finish() since it can be
called late at the end of MI configuration.

Obtained from:   Semihalf
Reviewed by:     andrew
Sponsored by:    The FreeBSD Foundation
Do not allocate zero-length mbuf in sosend_generic().

Found by:	pho
Sponsored by:	Nginx, Inc.
Add BERI-specific virtio mmio "platform" device.
This device provides a connector to Altera PIO allowing us
to interrupt software-implemented virtio mmio backend.

Sponsored by:	DARPA, AFRL
In vnode_pager_generic_getpages() vp->v_mount is dereferenced in the
beginning, thus can't be NULL.

Sponsored by:	Nginx, Inc.
Use __func__ in KASSERTs, since the code is about to be moved to other place.

Sponsored by:	Nginx, Inc.