Flesh out some more docker container methods

First cut of Docker container creation and start should be working now

Tested using the REST API:
curl -i -X POST -H 'X-Auth-Token: 1b238d90cd0645a39a626581cf0c9f19' \
     -H 'Content-Type: application/json' \
	 -H 'Accept: application/json' \
	 -d '{"image_id": "cirros", "name": "mycontainer"}' \
	 http://127.0.0.1:9511/v1/v1/containers

curl -i -X PUT -H 'X-Auth-Token: 1b238d90cd0645a39a626581cf0c9f19' \
     -H 'Content-Type: application/json' \
	 -H 'Accept: application/json' \
	 -H 'User-Agent: python-magnumclient' \
	 http://127.0.0.1:9511/v1/containers/4e19a981-057f-4d55-9aaf-d12c06e6430a/start

And the magnum CLI:
echo '{"name":"mycontainer", "image_id":"cirros"}' | magnum --debug container-create
magnum --debug container-start --id c6d6c759-9875-4dd4-aaa3-619799015c1d

Change-Id: Ib7a46d95d2d89cd8479bb0a318a3c9efaf23f187