Add script to bundle blimp engine into a Docker image

The blimp engine will run as a Docker container, and this CL adds the tools
to be able to do that.

There are three main parts:
- The Dockerfile: Defines what should be part of the Docker image.
- bundle-engine.py: Bundles the blimp engine and all its runtime dependencies
  into a tarball. This tarball also contains the Dockerfile itself.
- Building a Docker image. This can easily be done by using the tarball that
  bundle-engine.py generates. This part is only documented and is not itself
  packaged into a script.

To create the tarball, you execute:
$ ./blimp/tools/bundle-engine.py \
    --build-dir ./out-linux/Debug \
    --dockerfile ./blimp/engine/Dockerfile \
    --target blimp/engine:blimp_engine \
    --output ./out-linux/Debug/blimp_engine_deps.tar

You can then build the Docker image with:
$ docker build -t blimp_engine - < ./out-linux/Debug/blimp_engine_deps.tar

You can then run your Docker container with:
$ docker run blimp_engine --with-my-flags

BUG=538353

Review URL: https://codereview.chromium.org/1380123004

Cr-Commit-Position: refs/heads/master@{#352386}

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