Virt-viewer fails to start

Originally created by @bertagaz on #13460 (Redmine)

Happened 20 times in June, 37 for what 2017 logs we have.

It may be that restarting the VM is taking a bit more time than before, as the screenshot shows.

Setting the priority a bit higher, as it can happen in all scenarios.

Edited May 21, 2020 by bertagaz

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