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Add executable flag to models so that they can be run from the download_and_preprocess_imagenet.sh script automatically

Tested on GCE with ubuntu 16.04. Mirrors change 157536266.

Fixes tensorflow/tensorflow#10239

Default is TensorFlow default of 'grpc' communication protocol.
If TensorFlow was complied with Verbs support 'grpc+verbs' can be
used to accelerate the tensor passing communication.

This broke the bazel build of inception/download_and_preprocess_flowers
The way that this script is written doesn't actually allow it to be ran
outside bazel, some refactoring would be needed if you want to run it
standalone.

It should be ran using

```
bazel build inception/download_and_preprocess_flowers

bazel-bin/inception/download_and_preprocess_flowers
"${FLOWERS_DATA_DIR}"
```

curl is pre-installed on the mac and the tensorflow docker image. wget
is not. This change allows this script to run on a stock mac, or in the
tensorflow docker image

- Removed replica_id which was removed from SyncReplicaOptimizer in V1.
- Removed call for get_clean_up_op which was removed from optimizer in V1.

`tf.mul` -> `tf.multiply`