snmp-adaptor: Support for Objects like e.g. InvocationStatistics

The snmp-adaptor needs to support complex objects like e.g. InvocationStatistics that return a list of values.

So if e.g. 1.2.3.4 is a InvocationStat stats, then 1.2.3.4.x would be a 'list of all methods in the InvocationStatistics' and 1.2.3.4.x.y would then denote for the y-Values the individual values as e.g. cound, minTime etc.