Fix incorrect tag in BuildConfig.

For services with build and image keys DeploymentConfig respects tag from docker-compose image key.
But BuildConfig image tag was always set to  'latest'.
Result of this was that deployment wasn't trigired after successful build.
This fixes it by setting BuildConfig output image tag to the same tag that is used for  DeploymentConfig (tag from docker-compose image key)

pkg/transformer/openshift/openshift.go

@@ -245,7 +245,7 @@ func initBuildConfig(name string, service kobject.ServiceConfig, repo string, br
 				Output: buildapi.BuildOutput{
 					To: &kapi.ObjectReference{
 						Kind: "ImageStreamTag",
-						Name: name + ":latest",
+						Name: name + ":" + getImageTag(service.Image),
 					},
 				},
 			},