Shuffle test failures on mako and maguro builds

[Victor Thompson]

We need to investigate both any remaining random failures of the shuffle autopilot test and the recent failure in the device image.

From the failed build (https://jenkins.qa.ubuntu.com/job/trusty-touch-maguro-smoke-music-app-autopilot/19/consoleFull) note the following:

initctl: Unknown instance: com.ubuntu.music_music_1.1.245
14:52:40.461 INFO testcase:353 - Click package com.ubuntu.music_music_1.1.245 has been launched with PID 2784
14:52:44.461 INFO __init__:414 - dbus.DBusException while attempting to get PID for :1.48: DBusException("Could not get PID of name ':1.48': no such name",)

Compare that to a successful build (https://jenkins.qa.ubuntu.com/job/trusty-touch-maguro-smoke-music-app-autopilot/17/console) where the DBusException "Could not get PID of name..." error does not appear.

[Ubuntu Phone Apps Jenkins Bot (ubuntu-phone-apps-jenkins-bot)]

Fix committed into lp:music-app at revision 255, scheduled for release in music-app, milestone 1.0