FreeNAS Code

move some classes/method related to zfs for future use in replacement;
a lot of work is still required for a better API for a more pythonic
way of retrieving the state of the pool

Merge in a few revisions from iXsystems' repository:

- Use -f when attaching zpool vdev. In the case the device is not totally
erased, we would not be able to attach them without this change.
- Eliminate unneeded multiple zfs get runs. This is mostly a rewrite of
zfs_get_options by adopting get_zfs_attributes's ideas that only runs
zfs(8) once and get all attributes in a batch.
- Remove the unused [sg]et_zfs_attribute[s].

make sure newfs for single disk doesnt hit the .wait() pipe limit

Oops. Forgot some d's.

Make notifier aware of ix-syslog.

Support for specifying mountpoints added.

Update notifier to use the generic ACL code.

Back out several commits, set UFS volumes to uae nfsv4acls

Implement a middleware call to reset snapshots to 'NEW' state which is
useful for replication.

Implement a middleware call for (forcibly) releasing snapshots from
replication system.