LAG upgrade - 27: updating member port activation handler

Updating the #member #port #activation handler in LAG module. The references to the augmented custom member port data-structures has been updated to the standard member port data-structures. This allows to directly use the #standard #member #port data-structure and use the #embedded custom member port data-structure for internal operations. The #status related parameters are kept in the custom data-structure and on member port status #change these are updated as #active / #not-in-service. When ports are not ready to participate in the normal operations because of inconsistency in the applied configuration the state is set as #not-ready.

#LAG update 35 ...
[commit f0301884d9fabadfd09736b26fa5fc3c63f3bcf9] (https://github.com/nes-repo/NES-Open-Switch/commit/f0301884d9fabadfd09736b26fa5fc3c63f3bcf9)