Docker Swarm support

[marc-]

Currently chef-provisioning-docker does not support Docker Swarm -- docker native clustering tool. chef-provisioning-docker workflow implies committing containers and reusing resulting images. This new image exists only on single node in the cluster, and Swarm is unable to track it and run container on node with that image.
This could be addressed on Swarm side by implementing images replication. But I didn't see any work in that direction so far.
Another way is to support Swarm filters in chef-provisioning-docker to be able to process all steps of convergence on the same node. It is also requires additional work if chef-zero used, so remote container could connect to chef-zero on provisioning node.