Supported deployment of XCAMP management logic.

We added a new service called 'xcamp_management_logic'. Under this
service, users should specific (1) the war file that packaged
the implementation of management logic, and (2) the topology
that the management logic should manage. For example:
<service name="xcamp_management_logic">
  <managed_topology>myTopology</managed_topology>
  <war_file>
    <file_name>MLogic.war</file_name>
  </war_file>
</service>