apparmor: allow access to Gnome keyring via DBus

Simon Dezielrequested to merge
sdeziel-guest/msmtp:gnome-keyring-aa-fixes into unstable

msmtp-gnome can get sercrets from Gnome keyring using DBus but a user reported that some permissions were missing [1]. In addition to those, more were added to allow prompting to unlock the keyring if need be.

1: https://bugs.launchpad.net/ubuntu/+source/msmtp/+bug/1875313/comments/7

Signed-off-by: Simon Deziel simon@sdeziel.info

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