FreeNAS Code

fix typo

fix swapoff while unlabelling

fix zfs detach disk

Remove sleep statements from AD code, moved to rc.d scripts as necessary.

support to replace graid3 disks

initial support for gmirror disk replacement

Use gpart destroy -F here instead of removing individual partitions.

Remove swap partition before detaching.

Drop swap right before disk is being destroyed.

bugfix: str.find method returns index which fails on if statement