Publish a separate monitor entry for each connection handler, which includes
the protocol, listen address/port, number of established connections, and
information about each connection.

Also, update the monitor API to make it possible to include a custom
objectclass in each monitor entry.  Connection handler monitor entries now
include the ds-connectionhandler-monitor-entry objectclass.  Backend monitor
entries now include the ds-backend-monitor-entry objectclass.

OpenDS Issue Numbers:  1066 and 1091