Adapt waiting for user notification facilities for Jessie
In 3f2e56a2c269d2a3d0cbf39b86c69276faf7d93b we introduce a lookup
notification-daemon process, which doesn’t run in GNOME Shell.
This needs to be adjusted.
Note that the pgrep we’re using isn’t fool-proof: anonym has seen at
least one failure when the process was running already, but the
notification wasn’t shown.
Likely we need to check if the DBus service is ready instead.
Feature Branch: feature/jessie