FreeNAS Code

- Use simpler python idioms for user/group add/modify/delete logic.
- Only initialize notifier once when possible.

Reimplement user lock, password disable and their backend support.

Revert r7638, this requires more work.

let user be created with password _and_ disabled
1. create user with a password
2. lock it right after

1. Drop unnecessary 'r' open mode flags.
2. Use ContextSuites instead of ad hoc open->read/write->close.

add a checkbox to allow multiple groups share the same gid

do some checks for bsdGroups, first pass for #658

typo

for some reason we need to check unique constrain on user add
unique="True" as a string was preventing that column to be unique

keep old label for submit button post-submit for Change Password