Comment 3 for bug 1612362

Verification done following [1], all steps performed, specifically:

+ Executed manual tests described in [2] and [3]
+ Done exploratory testing (install/uninstall snaps, connect/disconnect interfaces, search, list)
+ Verified new features:
  + snap prepare-image does not require sudo
  + process-control interface
  + do not sort results of find
  + new interface security rules
  + chown auth file
  + system-trace interface
+ Verified actual upgrade from 2.11 to 2.12
+ Checked interaction with classic apt install and update of debs
+ Installed/uninstalled snaps and debs from gnome-software center

[1] https://wiki.ubuntu.com/SnapdUpdates
[2] https://github.com/snapcore/snapd/blob/master/integration-tests/manual-tests.md
[3] https://docs.google.com/spreadsheets/d/1EfjoPHmorG8A5jobzwmCIhAqI4N2zUTwDtA1JjgTn_c/edit#gid=0