BF: mark two tests (test_{statsmodels,seaborn}) as requiring network
- [notworthit] closes #xxxx
- [nowtheywill] tests added / passed
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [notworthit] whatsnew entry

ok this is fine
ping on green Would you mind if I suggest a PR which would use such fake proxy setup for those runs with --skip-network? This would allow to detect such tests "hot" sure @yarikoptic always happy to have a mock for network testing (that shows if we are not doing it) ok, closing in favor of #19757 which includes this patch + http_proxy's setup for travis