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

[Andreas Pokorny]

Review: Needs Information

Needs fixing: Instead of a map use an array std::atomic<bool> of size HWC_NUM_DISPLAY_TYPES.
Needs information: What about the other scenario .. the display was just plugged in but there is no display information available yet? Or do we only experience unplug + still display conf readable problems?


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https://code.launchpad.net/~phablet-team/mir/track-plug-state/+merge/285854
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