[Merge] lp:~phablet-team/mir/track-plug-state into lp:mir

[Alfonso Sanchez-Beato]

Branch refreshed addressing comments.

Re: plugged in but no display information yet, I have not seen that. The only issue has been when unplugging the tablet.
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https://code.launchpad.net/~phablet-team/mir/track-plug-state/+merge/285854
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