In release/Makefile, remove exclusion of CVS directories in the
src/ and ports/ distributions.

While I am thinking about it, exclude .git directories for src/
and ports/, as somewhat of a followup to r262499.

Sponsored by:	The FreeBSD Foundation
Queue pending exceptions in the 'struct vcpu' instead of directly updating the
processor-specific VMCS or VMCB. The pending exception will be delivered right
before entering the guest.

The order of event injection into the guest is:
- hardware exception
- NMI
- maskable interrupt

In the Intel VT-x case, a pending NMI or interrupt will enable the interrupt
window-exiting and inject it as soon as possible after the hardware exception
is injected. Also since interrupts are inherently asynchronous, injecting
them after the hardware exception should not affect correctness from the
guest perspective.

Rename the unused ioctl VM_INJECT_EVENT to VM_INJECT_EXCEPTION and restrict
it to only deliver x86 hardware exceptions. This new ioctl is now used to
inject a protection fault when the guest accesses an unimplemented MSR.

Discussed with:	grehan, jhb
Reviewed by:	jhb
Chase r262505, and remove CVS exclusion from picobsd builds.

Sponsored by:	The FreeBSD Foundation
Revert r262466, as it does not compile on PowerPC.

Reported by:	jhibbits
Rework how WORLD_FLAGS and KERNEL_FLAGS are set, to remove an
unnecessary expr(1) call.

Inspired by:	hrs (a few months ago)
MFC after:	1 week
X-MFC-With:	r262499, r262505
Sponsored by:	The FreeBSD Foundation
Update release/release.conf.sample to reflect changes in r262509.

MFC after:	1 week
X-MFC-With:	r262509
Sponsored by:	The FreeBSD Foundation