Do not use xform_ipip as decapsulation fallback.

xform_ipip was used as fallback with low priority for IPIP
encapsulated packets that were decrypted. In some cases
it can decapsulate packets, that it shouldn't. This leads to situations,
when wrong configurations are magically working. Also it can propagate
wrong ingress interface and this can break security.

Now we redesigned the IPSEC code and IPIP encapsulation is called directly
from ipsec_output, and decapsulation is done in the ipsec_input with m_striphdr.

Differential Revision:	https://reviews.freebsd.org/D1220
MFC after:	1 month
Sponsored by:	Yandex LLC
Make igb and ixgbe check tunables at probe time.

This allows one to make a kernel module to tune the
number of queues before the driver loads.

This is needed so that a module at SI_SUB_CPU can set
tunables for these drivers to take.  Otherwise getenv
is called too early by the TUNABLE macros.

Reviewed by: smh
Phabric: https://reviews.freebsd.org/D1149
Add PCI ID for Intel Lynx Point LP controller.

PR:		kern/195398
Submitted by:	grembo
Obtained from:	DragonflyBSD
MFC after:	1 week
Whitespace cleanup to fix rendering nits in
src.conf(5).

Sponsored by:	The FreeBSD Foundation
Regen src.conf(5) after r275138.

Sponsored by:	The FreeBSD Foundation
Increase default and maximum callchain depths

Bump the default from 16 to 32, to accommodate kernel flamegraphs.
Bump the maximum from 32 to 128, to accommodate deep user stacks.

Reviewed by:	gnn
MFC after:	1 month
Sponsored by:	The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D1203
Merge remote-tracking branch 'freebsd/master' into hardened/current/master