New bugfix release of snapd:

• interfaces: add udev netlink support to hardware-observe
• interfaces/network-{control,observe}: allow receiving kobject_uevent() messages
• interfaces: fix network-manager plug regression
• hooks: do not error when hook handler is not registered
• interfaces/alsa,pulseaudio: allow read on udev data for sound
• interfaces/optical-drive: read access to udev data for /dev/scd*
• interfaces/browser-support: read on /proc/vmstat and misc udev data
• snap-seccomp: add secondary arch for unrestricted snaps as well
• Remove the Nice=-5 from the snapd.service file. This breaks in lxd containers

In addition, the snap userd functionality has been backported from upstream git master to support xdg-open within snaps.

New release of snapd-glib (summary of upstream changes from 1.16 to 1.22):

• Make QML module depend on libsnapd-qt being compiled first
• Fix compile warning
• Fix MOC detection in Fedora
• Handle Qt configure failures
• Stop distributing generated files
• New API:
  • snapd_client_get_allow_interaction
  • snapd_client_set_allow_interaction
  • snapd_snap_get_license
• Add mutex in request queue
• Ensure socket reads never block
• Fix issues when accessing snapd-glib from threads.
• snapd-qt: Emit the complete signal when requests are cancelled.
• Reduce json-glib dependency to 1.1.2.
• Documentation updates.
• Test improvements.