FreeNAS Code

Change ldap import to the correct one.

Use the symbolic name for EBUSY and don't taint the tb by calling raise
instead of reraising the OSError as a new instance.

M tools/cachetool.py

Added a 'dump' option to cachetool, this should help debug LDAP issues.

fixes to run cachetool at boot and upon service restart

Utility for managing freenas cache