Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

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

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

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

Make mlxcontrol work with more than one system drive:
- When searching for the next system drive, return the next one instead
of always returning the first one.
- Plug fd lead and make sure that the MLX_NEXT_CHILD ioctl is called
on the controller fd, not the disk's one.

While there, fix a cut-n-pase error in a warning.

Reviewed by: jhb
Approved by: kan (mentor)
MFC after: 1 month

Unhook headers from development tree and point to the actual system headers.

This commit was generated by cvs2svn to compensate for changes in r59138,
which included commits to RCS files with non-trunk default branches.

This is a command-line management tool for RAID controllers managed by the
mlx(4) driver.