test: sleep 30s after restarting mgt server in test_kubernetes_supported_versions.py to fix test failures with test_secondary_storage.py (apache#5962)

Author: weizhouapache

test/integration/smoke/test_kubernetes_supported_versions.py

@@ -94,7 +94,9 @@ def restartServer(cls):
         #Waits for management to come up in 5 mins, when it's up it will continue
         timeout = time.time() + 300
         while time.time() < timeout:
-            if cls.isManagementUp() is True: return
+            if cls.isManagementUp() is True:
+                time.sleep(30)
+                return
             time.sleep(5)
         return cls.fail("Management server did not come up, failing")