OPTIM/MINOR: move struct sockaddr_storage to the tail of structs

OPTIM/MINOR: move struct sockaddr_storage to the tail of structs

Struct sockaddr_storage is huge (128 bytes) and severely impacts the
cache. It also displaces other struct members, causing them to have
larger relative offsets. By moving these few occurrences to the end
of the structs which host them, we can reduce the code size by no less
than 2 kB !