[Merge] lp:~vicamo/telephony-service/use-qtfeedbackeffect-stop into lp:telephony-service

[Vicamo Yang]

This, together with https://code.launchpad.net/~vicamo/qtubuntu-sensors/reimplement-haptics-backend/+merge/300839 , should fix the crash that https://code.launchpad.net/~phablet-team/telephony-service/midori-workaround/+merge/299563 was intended for.
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https://code.launchpad.net/~vicamo/telephony-service/use-qtfeedbackeffect-stop/+merge/300841
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~vicamo/telephony-service/use-qtfeedbackeffect-stop into lp:telephony-service.