* Improves separation of concerns between `runDockerInspect` and
`convertDockerInspect`: `runDockerInspect` now just runs the command and
returns the output, while `convertDockerInspect` now does all of the
conversion and parsing logic.
* Improves testing of `convertDockerInspect` using real test fixtures.
* Fixes issue where the container port is returned instead of the host
port.
* Updates UI to link to correct host port. Container port is still
displayed in the button text, but the HostIP:HostPort is shown in a
popover.
* Adds stories for workspace agent UI
Cian Johnston