[meta] DNS testing in reforis
This issue is related to our meeting about better DNS diagnostic
[check_connection](https://gitlab.labs.nic.cz/turris/turris-os-packages/-/blob/master/utils/turris-utils/files/check_connection) script should be replaced with python version which could test other DNS settings (forwarding not working, DNS hijack etc.)
This script can use some functionality from [resolver_rpcd](https://gitlab.labs.nic.cz/turris/turris-os-packages/-/blob/master/net/resolver-conf/files/resolver_rpcd.py) (see https://pypi.org/project/ubus/ and [README.md](https://gitlab.labs.nic.cz/turris/turris-os-packages/-/blob/master/net/resolver-conf/README.md)) and read setting from uci https://gitlab.labs.nic.cz/turris/pyuci [resolver configuration](https://gitlab.labs.nic.cz/turris/turris-os-packages/-/blob/master/net/resolver-conf/files/resolver-omnia-config)
Related issues/MR:
* [x] pytest-xdist MR https://gitlab.nic.cz/turris/turris-os-packages/-/issues/317 / https://github.com/openwrt/packages/pull/13010
* [ ] https://gitlab.nic.cz/turris/turris-os-packages/-/issues/620
* [ ] augeas MR https://github.com/openwrt/packages/pull/12913
* [ ] Deckard MR https://gitlab.nic.cz/turris/turris-os-packages/-/merge_requests/460
cc @pspacek @kkoci
issue