This update for gnome-settings-daemon, gnome-shell fixes the following issues:

gnome-settings-daemon:

- Add support for recent UCM related changes in ALSA and PulseAudio. (jsc#SLE-16518)
- Don't warn when a default source or sink is missing and the PulseAudio daemon is restarting. (jsc#SLE-16518)
- Don't warn about starting/stopping services which don't exist. (bsc#1172760).

gnome-shell:

- Add support for recent UCM related changes in ALSA and PulseAudio. (jsc#SLE-16518)
- CVE-2020-17489: reset auth prompt on vt switch before fade in in loginDialog (bsc#1175155).

This update was imported from the SUSE:SLE-15-SP2:Update update project.