Add delay & retry to flakey weight splits test

tests/suite/test_v_s_route_weight_changes_dynamic_reload_many_splits.py

@@ -173,9 +173,19 @@ def test_vsr_weight_changes_dynamic_reload_many_splits(
         print("Step 3: Verify hitting the other backend.")
         ensure_response_from_backend(backends32_url, vsr_weight_changes_dynamic_reload_many_splits_setup.vs_host)
         wait_and_assert_status_code(200, backends32_url, vsr_weight_changes_dynamic_reload_many_splits_setup.vs_host)
-        wait_before_test(1)
-        resp = requests.get(
-            backends32_url,
-            headers={"host": vsr_weight_changes_dynamic_reload_many_splits_setup.vs_host},
-        )
-        assert "backend2" in resp.text
+        found = False
+        interval = 1
+        for _ in range(60):
+            resp = requests.get(
+                backends32_url,
+                headers={"host": vsr_weight_changes_dynamic_reload_many_splits_setup.vs_host},
+            )
+            if resp.status_code == 200 and "backend2" in resp.text:
+                print(
+                    f"After {_} retries at {interval} second interval, got {resp.status_code} & found backend2 in response. Continue with tests..."
+                )
+                found = True
+                break
+            wait_before_test(interval)
+
+        assert found is True