persistence if set self.app.config['SERVER_NAME']

[ReimarBauer]

the problems I had today after the merge was in test_server by setting in the test setup

self.app.config['SERVER_NAME'] = self.url.strip('http://')

this created a lot failing tests, e.g. test_socket failed

I assume the xdist tests have not run in this because they were distributed over several processes

We should do a code review for config settings in tests.

[ReimarBauer]

After implementation of https://open-mss.github.io/develop/GSOC/flask_native this can be closed