* Enable IPv6 by default for new installations
Enable IPv6 by default for new Supervisor installations. Let's also
make the `enable_ipv6` attribute nullable, so we can distinguish
between "not set" and "set to false".
* Add pytest
* Add log message that system restart is required for IPv6 changes
* Fix API pytest
* Create resolution center issue when reboot is required
* Order log after actual setter call
Configurable and w/ migrations between IPv4-Only and Dual-Stack
Signed-off-by: David Rapan <david@rapan.cz>
Co-authored-by: Stefan Agner <stefan@agner.ch>
