fix(docker): fix reuse_cluster to find instance

code was looking for docker instance by prefix, but
the api need to have `*` at the end for it to actully
find any instances

sdcm/cluster_docker.py

@@ -251,7 +251,7 @@ def _create_nodes(self, count, enable_auto_bootstrap=False):
 
     def _get_nodes(self):
         containers = ContainerManager.get_containers_by_prefix(self.node_prefix)
-        for node_index, container in sorted((int(c.labels["NodeIndex"]), c) for c in containers):
+        for node_index, container in sorted(((int(c.labels["NodeIndex"]), c) for c in containers), key=lambda x: x[0]):
             LOGGER.debug("Found container %s with name `%s' and index=%d", container, container.name, node_index)
             node = self._create_node(node_index, container)
             self.nodes.append(node)

sdcm/utils/docker_utils.py

@@ -406,7 +406,7 @@ def _build_args(**kwargs):
     @classmethod
     def get_containers_by_prefix(cls, prefix: str, docker_client: DockerClient = None) -> List[Container]:
         docker_client = docker_client or cls.default_docker_client
-        return docker_client.containers.list(all=True, filters={"name": prefix})
+        return docker_client.containers.list(all=True, filters={"name": f'{prefix}*'})
 
     @classmethod
     def get_container_name_by_id(cls, c_id: str, docker_client: DockerClient = None) -> str:

unit_tests/test_utils_docker.py

@@ -314,7 +314,7 @@ def test_get_environ(self):
 
     def test_get_containers_by_prefix(self):
         self.assertEqual(ContainerManager.get_containers_by_prefix("blah"),
-                         ((), {"all": True, "filters": {"name": "blah"}, }, ))
+                         ((), {"all": True, "filters": {"name": "blah*"}, }, ))
 
     def test_get_container_name_by_id(self):
         with self.subTest("Try to get name of non-existent container"):