MFC 259635:
Add an option to ignore accesses by the guest to unimplemented MSRs.

Also, ignore a couple of SandyBridge uncore PMC MSRs that Centos 6.4 writes
to during boot.
Document SA-14:05.nfsserver, SA-14:06.openssl.

Sponsored by:	The FreeBSD Foundation
Bump osreldate for tracking SA-14:06
Remove useless embedding of kernel struct rtentry into userland one.
This is direct commit to stable/10.

Sponsored by:	Nginx, Inc.
Merge r263203: garbage collect long time obsoleted (or never used) stuff
from routing API.
MFC r264039:
  Document more parition types.