pytest-based selenium tests add fix recording issue

When tests are very short and passed (they do not wait for any element).
Specifically: test_user_login, test_admin_login.
The action in UI (login and check the homepage) is super quick (0.5s-1s).
So the video is not even created - we do not need to clean it up.

Change-Id: Id8433842247258f472fa3951fcdfa2b0e78ae781

openstack_dashboard/test/selenium/conftest.py

@@ -148,7 +148,10 @@ def record_video(request, report_dir, xdisplay):
     popen.communicate()
     thread.join()
     if not request.node.stash.get(STASH_FAILED, False):
-        os.remove(filepath)
+        try:
+            os.remove(filepath)
+        except OSError:
+            pass
 
 
 @pytest.fixture(scope='session')