Add 'sleep 2' to avoid race condition on attach

Signed-off-by: Ulysses Souza <[email protected]>

Author: Ulysses Souza

tests/integration/api_container_test.py

@@ -1267,12 +1267,9 @@ def test_attach_no_stream(self):
     @pytest.mark.timeout(5)
     @pytest.mark.skipif(os.environ.get('DOCKER_HOST', '').startswith('ssh://'),
                         reason='No cancellable streams over SSH')
-    @pytest.mark.xfail(condition=os.environ.get('DOCKER_TLS_VERIFY') or
-                       os.environ.get('DOCKER_CERT_PATH'),
-                       reason='Flaky test on TLS')
     def test_attach_stream_and_cancel(self):
         container = self.client.create_container(
-            BUSYBOX, 'sh -c "echo hello && sleep 60"',
+            BUSYBOX, 'sh -c "sleep 2 && echo hello && sleep 60"',
             tty=True
         )
         self.tmp_containers.append(container)