LAG upgrade - 18: optimizing custom aggregator parameter entries

Updated #custom #aggregator #parameter agent mapper routines in LAG module. The agent #iterator routines and #mapper #routine has been updated to use standard #aggregator entry based #indexing. This will access the custom aggregator entries by using the #native #indexing. This removes references to the custom aggregator indexing used earlier. The custom aggregator parameter entries has been embedded in the standard aggregator entries. The custom aggregator parameter entries holds the #attributes like the #aggregator-group, #max-bandwidth, etc ...

#LAG update 26 ...
[commit 6dceb8662f0500f5b889db22e71877eb47c112a8] (https://github.com/nes-repo/NES-Open-Switch/commit/6dceb8662f0500f5b889db22e71877eb47c112a8)