Summary:
If automaticSocketNaming is enabled, it will use wl_display_add_socket_auto
to allocate the next free socket. The resulting name can be retrieved using
socketName after a successful start afterwards.
Test Plan: Ran the new autotest, passes. kwin_wayland still uses the old behaviour.
Reviewers: #kwin, #plasma, romangg
Reviewed By: #kwin, #plasma, romangg
Subscribers: davidedmundson, zzag, romangg, kde-frameworks-devel
Tags: #frameworks
Differential Revision: https://phabricator.kde.org/D17122
2184206c8b