This adds Clear Containers as a Kata Containers runtime, under
runtime/cc-runtime
The Docker `create`, `start`, `run`, `exec` and `ps` commands
work when using the cc-runtime code together with the vanilla
Kata shim, proxy and agent components. Shortly we will also
document how to build and install all of those together.
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>