Description of problem:

The RTGov activity collector and validator directly accesses the SecurityContext from the properties on the camel exchange. The problem with this approach is if the SecurityContext is sealed.

After discussion with Keith Babo and David Ward, the best approach is to access the SecurityContext using the SecurityContextManager - but this requires the use of the SwitchYard exchange instead of the Camel Exchange.

Therefore two changes are required:

1) Switch to using the switchyard ExchangeInitiatedEvent and ExchangeCompletionEvent, instead of the camel equivalent events. (RTGOV-247)

2) Change the AbstractExchangeValidator be based on the ExchangeInterceptor mechanism instead of Auditor. (RTGOV-311)