Ticket 367 - Invalid chaining config triggers a disk full error and shutdown
Bug Description: If you use the root DN for the chaining bind DN a error -2 (LDAP_LOCAL_ERROR)
is returned from the callback. This is the same error code for SLAPI_FAIL_DISKFULL.
Once the error -2 is retuned, the server thinks we are out of disk space and the
instance is shutdown.
Fix Description: Return -1, instead of -2(LDAP_LOCAL_ERROR)
Note: also did a little code cleanup with indentation