(Not complete strict confinement, but these don't break anything
devmode related, and get us closer to having strict confinement
working.)
Added more needed interfaces to snapcraft.yaml.
Created a wrapper around dnsmasq so that we can run as the snap_daemon
user. Added snap_daemon user to snapcraft.yaml.
Added a utility script for connecting interfaces that don't auto
connect (tools/connect.sh). Not useful for production, but saves a lot
of time when testing.
libvirt no longer uses unix sock group "sudo" (can't run setguid in
strict confinement).
Got rid of "find_missing_plugins" in init script. By the time we
release strict confinement to production, all those plugins will auto
connect.
Change-Id: I8324ac7bd0332c41cac17703eb15d7301e7babf3
c123af21d3