Record failure reasons for image pulling

[yujuhong]

No description provided.

[yujuhong]

Hmm....okay. This needs more work. Don't review just yet.

[vmarmol]

lol, kk. Let me know

[yujuhong]

Ready for review finally :)

I think we can safely unexport RunContainer after this PR.

[vmarmol]

LGTM, thanks for adding a test!

[yujuhong]

An example of the output:

$ ./cluster/kubectl.sh get pods
POD       IP          CONTAINER(S)   IMAGE(S)    HOST                  LABELS    STATUS    CREATED          MESSAGE
foo       10.0.0.53                              127.0.0.1/127.0.0.1   <none>    Pending   About a minute   
                      bar1           fooimage1                                   Waiting                    Error: image library/fooimage1:latest not found
                      bar2           fooimage2                                   Waiting                    Error: image library/fooimage2:latest not found

./cluster/kubectl.sh describe pods foo
W0511 13:23:39.029576   13663 request.go:291] field selector: v1beta3 - events - involvedObject.namespace - default: need to check if this is versioned correctly.
W0511 13:23:39.029650   13663 request.go:291] field selector: v1beta3 - events - involvedObject.uid - 14feb2ff-f81b-11e4-b86a-c4346b658736: need to check if this is versioned correctly.
W0511 13:23:39.029664   13663 request.go:291] field selector: v1beta3 - events - involvedObject.name - foo: need to check if this is versioned correctly.
Name:               foo
Image(s):           fooimage1,fooimage2
Host:               127.0.0.1/127.0.0.1
Labels:             <none>
Status:             Pending
Replication Controllers:    <none>
Containers:
  bar1:
    Image:      fooimage1
    State:      Waiting
      Reason:       Error: image library/fooimage1:latest not found
    Ready:      False
    Restart Count:  0
  bar2:
    Image:      fooimage2
    State:      Waiting
      Reason:       Error: image library/fooimage2:latest not found
    Ready:      False
    Restart Count:  0
Conditions:
  Type      Status
  Ready     False 
Events:
  FirstSeen             LastSeen            Count   From            SubobjectPath               Reason      Message
  Mon, 11 May 2015 13:19:52 -0700   Mon, 11 May 2015 13:19:52 -0700 1   {scheduler }                            scheduled   Successfully assigned foo to 127.0.0.1
  Mon, 11 May 2015 13:19:52 -0700   Mon, 11 May 2015 13:19:52 -0700 1   {kubelet 127.0.0.1} implicitly required container POD   pulled      Successfully pulled image "gcr.io/google_containers/pause:0.8.0"
  Mon, 11 May 2015 13:19:53 -0700   Mon, 11 May 2015 13:19:53 -0700 1   {kubelet 127.0.0.1} implicitly required container POD   created     Created with docker id 9bcdcd2c4fd677a82cd4607aac2f325b090b9d69b9cd6f0da2ce560ec53d9b0a
  Mon, 11 May 2015 13:19:53 -0700   Mon, 11 May 2015 13:19:53 -0700 1   {kubelet 127.0.0.1} implicitly required container POD   started     Started with docker id 9bcdcd2c4fd677a82cd4607aac2f325b090b9d69b9cd6f0da2ce560ec53d9b0a
  Mon, 11 May 2015 13:19:54 -0700   Mon, 11 May 2015 13:23:33 -0700 23  {kubelet 127.0.0.1} spec.containers{bar1}           failed      Failed to pull image "fooimage1": Error: image library/fooimage1:latest not found
  Mon, 11 May 2015 13:19:55 -0700   Mon, 11 May 2015 13:23:34 -0700 23  {kubelet 127.0.0.1} spec.containers{bar2}           failed      Failed to pull image "fooimage2": Error: image library/fooimage2:latest not found