Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

- Fix leak of struct nlminfo on process exit.
- Fix malloc type collision, that made the above problem
difficult to understand.

Reported by: Vladimir Sharun <sharun ukr.net>

Cleanup and split of nfs client and server code.
This builds on the top of several repo-copies.

Implement client side NFS locks.

Obtained from: BSD/os
Import Ok'd by: mckusick, jkh, motd on builder.freebsd.org