Allow accepting client connections on multiple sockets

libwayland-server allows the wl_display accept client connections on
more than one socket. We currently don't listen on multiple sockets,
but it would be nice if Display supported such operation mode.
1 job for master in 6 minutes and 9 seconds (queued for 3 minutes and 12 seconds)
Status Job ID Name Coverage
passed #81758
linux kf5-qt5 qt5.15