While the VM we launch is a clean image the spotlight starts indexing
right after the boot. That seems to require quite a lot of resources.
Build machine doesn't need the feature, so we are disabling it.
Change-Id: I2c5f0030d7a687cfbded4e9bd4da70302cb0a933
Reviewed-by: Liang Qi <liang.qi@qt.io>
