Fix delete-old when WITH_TESTS is set.

r265423 removed the WITHOUT_BMAKE option, which in turn broke a conditional
in OptionalObsoleteFiles.inc that inspected MK_BMAKE.
abort(3) the process in response to a VMEXIT_ABORT. This usually happens in
response to an unhandled VM exit or an unexpected error so a core is useful.

Remove unused macro VMEXIT_SWITCH.

Reviewed by:	grehan
Fix checksum computation.  Previously it didn't include carry.

Reviewed by:	tuexen
Disable TX IP/TCP/UDP checksum offloading for RTL8168C/RTL8168CP.
Previously only TX IP checksum offloading was disabled but it's
reported that TX checksum offloading for UDP datagrams with IP
options also generates corrupted frames.  Reporter's controller is
RTL8168CP but I guess RTL8168C also have the same issue since it
shall share the same core.

Reported and tested by:	tuexen
On a fork allow read-only wired pages to be copy-on-write shared between the
parent and child processes.  Previously, we copied these pages even though
they are read only.  However, the reason for copying them is historical and
no longer exists.  In recent times, vm_map_protect() has developed the
ability to copy pages when write access is added to wired copy-on-write
pages.  So, in this case, copy-on-write sharing of wired pages is not to be
feared.  It is not going to lead to copy-on-write faults on wired memory.

Reviewed by:	kib
MFC after:	1 week
Sponsored by:	EMC / Isilon Storage Division
- Isochronous transfers should use the alternate next transfer
descriptor upon receiving a short packet, in host and device mode.
- Correct some comments.
Add mention of metadata version 7 in FreeBSD 10.0

Reviewed by:	pjd
MFC after:	1 day
Don't include the guest memory segments in the bhyve(8) process core dump.
This has not added a lot of value when debugging bhyve issues while greatly
increasing the time and space required to store the core file.

Passing the "-C" option to bhyve(8) will change the default and dump guest
memory in the core dump.

Requested by:	grehan
Reviewed by:	grehan
printf: Fix missing arguments for %u/%o/%x/%X after r265592.

If a numeric argument is missing, zero should be assumed, for signed as well
as unsigned conversions.

This fixes the 'zero' regression tests.

r265592 erroneously reverted r244407.
MFV of 265975, tzdata2014c

- Egypt will go into DST on 15 May 2014
Fix OpenSSL NULL pointer deference vulnerability.

Obtained from:	OpenBSD
Security:	FreeBSD-SA-14:09.openssl
Security:	CVE-2014-0198
Switch using the new $2b$ format by default, when bcrypt is used.

MFC after:	2 weeks
Relnotes:	default Blowfish crypt(3) format have been changed to $2b$.