Add an SMTP account status notification handler, which can be configured to
send e-mail messages whenever an account status notification is generated.  The
message can be sent to the end user impacted by the notification (based on an
attribute in the user's entry) and/or a fixed set of recipients.

The messages that will be generated are created from template files, which can
include tokens that will be replced with things like:

- The name of the notification type
- The notification message
- The DN of the target user's entry
- Attribute values from the target user's entry
- Values of account status notification properties, which may vary based on the
  type of notification

This change also includes a fix for a problem that could allow password
expiration warning messages to be sent to a client even if the bind was not
successful.


OpenDS Issue Number:  581