[Draft] libnm: use `nm_setting_connection_get_controller()` where possible
Summary
libnm: use nm_setting_connection_get_controller()
where possible
Purpose
libnm: use the new NMSettingConnection Controller property
To enforce conscious language support, use
`nm_setting_connection_get_controller()` where possible and replace
`nm_setting_connection_get_master()`.
https://issues.redhat.com/browse/RHEL-28623
Checklist
Please read https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/blob/main/CONTRIBUTING.md before opening the merge request. In particular, check that:
-
the subject for all commits is concise and explicative -
the message for all commits explains the reason for the change -
the source is properly formatted -
any relevant documentation is up to date -
you have added unit tests if applicable