Added restart of node1 for running multiple iterations of test

tests/integration/test_keeper_s3_snapshot/test.py

@@ -2,6 +2,7 @@ import pytest
 from helpers.cluster import ClickHouseCluster
 from time import sleep
 from retry import retry
+import helpers.keeper_utils as keeper_utils
 
 from kazoo.client import KazooClient
 
@@ -125,3 +126,5 @@ def test_s3_upload(started_cluster):
     )
 
     destroy_zk_client(node2_zk)
+    node1.start_clickhouse() # for next iteration
+    keeper_utils.wait_until_connected(cluster, node1)