[skip ci]Add function to get pod list (#12990)

Signed-off-by: zhuwenxing <wenxing.zhu@zilliz.com>

tests/python_client/utils/util_k8s.py

@@ -55,5 +55,29 @@ def wait_pods_ready(namespace, label_selector, expected_num=None, timeout=360):
     return all_pos_ready_flag
 
 
+def get_pod_list(namespace, label_selector):
+    """
+    get pod list with label selector
+
+    :param namespace: the namespace where the release
+    :type namespace: str
+
+    :param label_selector: labels to restrict which pods to list
+    :type label_selector: str
+
+    :example:
+            >>> get_pod_list("chaos-testing", "app.kubernetes.io/instance=test-proxy-pod-failure, component=proxy")
+    """
+    config.load_kube_config()
+    api_instance = client.CoreV1Api()
+    try:
+        api_response = api_instance.list_namespaced_pod(namespace=namespace, label_selector=label_selector)
+        return api_response.items
+    except ApiException as e:
+        log.error("Exception when calling CoreV1Api->list_namespaced_pod: %s\n" % e)
+        raise Exception(str(e))
+
+
 if __name__ == '__main__':
-    wait_pods_ready("chaos-testing", "app.kubernetes.io/instance=scale-query")
+    label = "app.kubernetes.io/instance=test-proxy-pod-failure, component=proxy"
+    res = get_pod_list("chaos-testing", label_selector=label)