FreeNAS Code

Ability to upload/install PBI files into a jail added.

quick and dirty "cache" for disk serial

try to deal with multipath to do not add a physical disk twice

log notifier.sysctl calls as suggested by delphij

Add a simple method to retrieve sysctl using libc
This should reduce a bit of the subprocess overhead (specially for the geom confxml case)
While I'm here also take ipv6 alias into account

make sure to destroy lagg interface

Add ZFS version API and add def. prog. to APIs.

Also document requirements using RST so that people can understand
clearly what the requirements and intent of the APIs are.

use xml eval instead of go through glabel status -s process

add a disk_serial field in Disk to hold serial #

plugins jail logic.