FreeNAS Code

use empty string instead of None/NULL (this is how django do things)

Remove unrelated change committed in r9041.

Change some debug statements from syslog.LOG_NOTICE into syslog.LOG_DEBUG to quiet down unnecessary noise at boot on the console.

Update the FreeBSD release when ix-motd is run so folks aren't confused about it not reporting the right version :).

method that checks if a plugins jail has been configured added

Kill off plugins before stopping jail, start plugins up after jail

This slipped. Oops.

Looks like I needed __system_nolog instead of __system... much grief over this one.

Rename to plugins_jail to ease confusion in my own mind.

1. Create variables for cd-upgrade and need-update so that scripts can refer to the variables if need be from within rc.freenas; this also makes the variable names easier to search for when looking for affected sections of code.
2. Fix the fact that failed CD based upgrades were in fact broken due to the fact that install.sh created the file as cd_update and ix-update expected for there to be a file named cd_upgrade. Favor the filename cd-upgrade because this is consistent with what's being used with need-update as it uses a dash instead of an underscore, and also because semantically cd *upgrade* reflects the operation being performed better than cd *update* does.