LAG upgrade - 26: cleaning up LAG management framework for data-structure changes

Added miscellaneous changes in #management #framework in LAG module. #Cleaned up #aggregator #activation handler and added #initialized aggregator #parameters with their #default values. Corrected standard #extended #member #port #iterator routine to provide reference to the standard member port, so that extended parameters embedded in them can be accessed in the mapper routine. Corrected #member #port #create #API to create #statistics, #debug and #extended port #data-structures as part of the member port creation. Corrected #aggregator #create #API to create the #member port #list as part of aggregator creation.

#LAG update 34 ...
[commit 3302d18556d2f6e7652b93118f9ecd186e3451fe] (https://github.com/nes-repo/NES-Open-Switch/commit/3302d18556d2f6e7652b93118f9ecd186e3451fe)