[Bug 1090071] New: `docker start` doesn't fail on started container

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1090071

Bug ID: 1090071
           Summary: `docker start` doesn't fail on started container
           Product: Fedora
           Version: 20
         Component: docker-io
          Assignee: [e-mail]
          Reporter: [e-mail]
        QA Contact: [e-mail]
                CC: [e-mail], [e-mail],
                    [e-mail], [e-mail],
                    [e-mail], [e-mail], [e-mail]

Description of problem:
On older (0.9) docker, the `docker start $running_container` failed. The new
0.10.2 version just prints the container name and proceeds.

Version-Release number of selected component (if applicable):
docker-io-0.10.0-2.fc20.x86_64

How reproducible:
Always

Steps to Reproduce:
1. docker run -i -t -name test fedora bash
2. docker start test

Actual results:
[root@t530 ~]# docker start test
test
[root@t530 ~]# echo &?
0

Expected results:
[root@t530 ~]# docker start test
Error: Cannot start container test: The container
429d709bc86c037b09e9f74dfab40aa33dc19bcf3109daf3f5b2fbbd3c6df297 is already
running.
2014/04/22 15:29:28 Error: failed to start one or more containers
[root@t530 ~]# echo &?
1