message: Update component owners
diff: /tensorflow/core/nccl/ @azaks2 @chsigg
  /tensorflow/core/platform/windows/ @mrry
  /tensorflow/core/platform/s3 @yongtang
  +/tensorflow/python/autograph/ @mdanatg @kkimdev
  /tensorflow/python/debug @caisq
  /tensorflow/python/eager @jaingurav @alextp
  /tensorflow/python/tools/api/generator/ @annarev
  # contrib
  # NEED OWNER: /tensorflow/contrib/all_reduce
  +/tensorflow/contrib/autograph/ @mdanatg @kkimdev
  /tensorflow/contrib/batching/ @alextp @chrisolston
  /tensorflow/contrib/bayesflow/ @ebrevdo @rsepassi @jvdillon
  /tensorflow/contrib/boosted_trees/ @sshrdp @yk5 @nataliaponomareva
  