cli integration: sync container & image deletion

This makes container and image removal in the tests run synchronously.

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)

integration-cli/docker_cli_commit_test.go

@@ -27,8 +27,8 @@ func TestCommitAfterContainerIsDone(t *testing.T) {
 	out, _, err = runCommandWithOutput(inspectCmd)
 	errorOut(err, t, fmt.Sprintf("failed to inspect image: %v %v", out, err))
 
-	go deleteContainer(cleanedContainerID)
-	go deleteImages(cleanedImageID)
+	deleteContainer(cleanedContainerID)
+	deleteImages(cleanedImageID)
 
 	logDone("commit - echo foo and commit the image")
 }