Description of problem:
I've downloaded a docker image using "docker pull bradrydzewski/mongodb:2.4"
and when I wanted to run it I did a "docker run bradrydzewski/mongodb" as the image name was named like that, and I saw docker pulling another image (the size was different), so I hit Ctrl+C thinking to going kill the operation.

However a ps fax showed me dockerd was still downloading something, certainly image bradrydzewski/mongodb

Version-Release number of selected component (if applicable):
docker-io-0.7.0-14.fc20.x86_64

How reproducible:
100 %

Steps to Reproduce:
1. docker pull bradrydzewski/mongodb:2.4 (let the complete operation happens)
2. docker run bradrydzewski/mongodb, and hit ctrl+c after few seconds

Actual results:
Dockerd still download image

Expected results:
docker client should ask Dockerd to cancel the download of the image