[Merge] lp:~vicamo/lxc-android-config/add-upstart-local-bridge into lp:lxc-android-config

[Vicamo Yang]

Added missed force-mtp.service. Then eng-build device should automatically start adbd service.
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https://code.launchpad.net/~vicamo/lxc-android-config/add-upstart-local-bridge/+merge/307144
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~vicamo/lxc-android-config/add-upstart-local-bridge into lp:lxc-android-config.