D15789: Support QXL hotplug_mode_update

[Aleix Pol Gonzalez]

apol created this revision.
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REVISION SUMMARY
  QXL is a driver used mainly in VMs.
  This driver, it creates a new preferred mode upon resize instead of just
  offering the one and resizing it. This makes Plasma not resize when it should
  as described on the bug report below.
  This patch allows kscreen to know if the driver considers we should be
  following the preferred mode.
  
  https://bugzilla.redhat.com/show_bug.cgi?id=1290586

TEST PLAN
  Tested extensively on one of these vms and outside.

REPOSITORY
  R110 KScreen Library

BRANCH
  apol/libkscreen

REVISION DETAIL
  https://phabricator.kde.org/D15789

AFFECTED FILES
  backends/xrandr/xrandr.cpp
  backends/xrandr/xrandr.h
  backends/xrandr/xrandroutput.cpp
  backends/xrandr/xrandroutput.h
  src/configserializer.cpp
  src/output.cpp
  src/output.h

To: apol, #plasma
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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