Update code owner for contrib/{kafka,kinesis}

Add myself so that issues or PRs could be assigned to me.

Note contrib/{kafka,kinesis} might be moved:
tensorflow/community#18

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

Author: yongtang

CODEOWNERS

@@ -31,9 +31,12 @@
 /tensorflow/contrib/gan/ @joel-shor
 /tensorflow/contrib/graph_editor/ @purpledog
 # NEED OWNER: /tensorflow/contrib/grid_rnn/
+/tensorflow/contrib/hadoop @yongtang
 /tensorflow/contrib/hvx/ @satok16
 /tensorflow/contrib/integrate/ @shoyer
+/tensorflow/contrib/kafka @yongtang
 /tensorflow/contrib/kernel_methods/ @petrosmol
+/tensorflow/contrib/kinesis @yongtang
 /tensorflow/contrib/ios_examples/ @petewarden
 /tensorflow/contrib/labeled_tensor/ @shoyer
 /tensorflow/contrib/layers/ @fchollet @martinwicke