FreeNAS Code

validation errors in previous steps (which may happen when the form wizard
have been done and there is validator for previous forms).

Utilize the functionality in storage wizard by redirecting to /storage/
directly, where the user can remove the volume if there is need of making
changes. This hopefully fixes ticket #28 as we do not have other ways
to reproduce the problem (yet).

While I'm there fix ZFS stripe volume creation.

Submitted by: delphij (Xin Li)