Hash based attributes were not parsed properly by container_get. This
patch fixes that and adds support for tty, attach_stdin, attach_stdout,
attach_stderr, links, port bindings and exposed ports.
In order to test this properly, responses from the mock return values
closer to what the API actually returns. Examples are from Remote API
1.18.
downcasing hash keys cannot be performed on all Docker API operations so
now it will only be done where the top element is a hash. Logs, top, and
many others will not return a hash.
