[pytest]: Increase timeout when checking services (sonic-net#2000)

Increase timeout during VS tests when checking DVS services

Signed-off-by: Lawrence Lee <lawlee@microsoft.com>

tests/conftest.py

@@ -459,7 +459,7 @@ def check_ready_status_and_init_db(self) -> None:
             self.destroy()
             raise
 
-    def check_services_ready(self, timeout=30) -> None:
+    def check_services_ready(self, timeout=60) -> None:
         """Check if all processes in the DVS are ready."""
         service_polling_config = PollingConfig(1, timeout, strict=True)