maintainers: update for stable branches
maintainers: update for stable branches

I am maintaining 16.11 until November 2018

Signed-off-by: Luca Boccassi <020748dc039465edc3ee6f30c530b21164cdce27@debian.org>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk