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

[Alan Griffiths]

Review: Needs Fixing

+ if (is_plugged[mga::as_hwc_display(display_name)].load() == false)

Can be written

  if (!is_plugged[mga::as_hwc_display(display_name)])

~~~~

+    is_plugged[HWC_DISPLAY_PRIMARY].store(true);
+    is_plugged[HWC_DISPLAY_EXTERNAL].store(false);
+ is_plugged[HWC_DISPLAY_VIRTUAL].store(true);

Constructors should use initialization, not assignment
-- 
https://code.launchpad.net/~phablet-team/mir/track-plug-state/+merge/285854
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