Fixing some python3 failures.  Fixes much of tensorflow python tests and tensorboard server_test.
Fixing some python3 failures.  Fixes much of tensorflow python
tests and tensorboard server_test.

tensorflow/tensorboard,francoisluus/tensorboard-supervise,tensorflow/tensorboard,shakedel/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,agrubb/tensorboard,agrubb/tensorboard,ioeric/tensorboard,ioeric/tensorboard,agrubb/tensorboard,shakedel/tensorboard,tensorflow/tensorboard,francoisluus/tensorboard-supervise,tensorflow/tensorboard,qiuminxu/tensorboard,qiuminxu/tensorboard,francoisluus/tensorboard-supervise,ioeric/tensorboard,tensorflow/tensorboard,agrubb/tensorboard,agrubb/tensorboard,qiuminxu/tensorboard,francoisluus/tensorboard-supervise,agrubb/tensorboard,ioeric/tensorboard,shakedel/tensorboard,qiuminxu/tensorboard,francoisluus/tensorboard-supervise,francoisluus/tensorboard-supervise,ioeric/tensorboard,shakedel/tensorboard,shakedel/tensorboard,shakedel/tensorboard,qiuminxu/tensorboard,qiuminxu/tensorboard,ioeric/tensorboard