Add support for a new disconnect client task that can be used to allow an
administrator to terminate a client connection if the need arises.  The
requester must have the disconnect-client privilege.  The task entry should
contain the ds-task-disconnect object class, which requires the
ds-task-disconnect-connection-id attribute type and optionally allows the
ds-task-disconnect-notify-client and ds-task-disconnect-message attribute
types.

Also, add support for a "Get Connection ID" extended operation, which allows a
client to determine the connection ID associated with its connection in the
server.

OpenDS Issue Numbers:  429, 478, 2025