buidler/docker: remove container [GH-1206] [GH-1095]

CHANGELOG.md

@@ -32,6 +32,7 @@ BUG FIXES:
   * builder/amazon/all: `delete_on_termination` set to false will work.
   * builder/amazon/all: More desctriptive error messages if Amazon only
       sends an error code. [GH-1189]
+  * builder/docker: Remove the container during cleanup. [GH-1206]
   * builder/googlecompute: add `disk_size` option. [GH-1397]
   * builder/openstack: Region is not required. [GH-1418]
   * builder/parallels-iso: ISO not removed from VM after install [GH-1338]

builder/docker/driver_docker.go

@@ -149,7 +149,11 @@ func (d *DockerDriver) StartContainer(config *ContainerConfig) (string, error) {
 }
 
 func (d *DockerDriver) StopContainer(id string) error {
-	return exec.Command("docker", "kill", id).Run()
+	if err := exec.Command("docker", "kill", id).Run(); err != nil {
+		return err
+	}
+
+	return exec.Command("docker", "rm", id).Run()
 }
 
 func (d *DockerDriver) Verify() error {