tests/int/*.bats: make sure to delete containers

With some grep|awk help, found a few places where the containers
supposed to be removed in teardown() weren't.

To find container names:

	grep -E '^[[:space:]]*\<_*_*runc\>.*\<(create|run|restore)\>'

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

tests/integration/checkpoint.bats

@@ -12,6 +12,7 @@ function setup() {
 
 function teardown() {
   teardown_busybox
+  teardown_running_container test_busybox_restore
 }
 
 function setup_pipes() {