Modify ManageNodeServlet to work like the ReST API for ifservices

Now, the temporary states (i.e., 'Rescan to Suspend' and 'Rescan to
Resume') are not going to be used. The WebUI will put the status of the
ifservices entry to be 'F' (force unmanaged) or 'A' (managed) and then
generate the appropriate events (like the ReST API).
Adding validations to IfServicesRestService

Generate HTTP 404 when:

a) The supplied criteria doesn't return any valid OnmsMonitoredService
b) When the supplied list of services to modify doesn't match the list
   of OnmsMonitoredServices returned from the supplied criteria.