adjustments related with removals/changes in the CI-OMS interface spec

remove functionality related with changes in the CI-OMS interface specification (in particular re the removal on the 'event type' concept); and do adjustments while starting testing with the actual RSN OMS endpoint implementation (eg., use of the xml/rpc handlers they are using). Still some adjustments to do.

Note: all platform unit and integrations tests passing against the simulator (as usual), and some now starting to pass against the actual RSN implementation, but the latter is still preliminary.