util: Introduce virFileWaitForExists
Since we have a number of places where we workaround timing issues with
devices, attributes (files in general) not being available at the time
of processing them by calling usleep in a loop for a fixed number of
tries, we could as well have a utility function that would do that.
Therefore we won't have to duplicate this ugly workaround even more.
Signed-off-by: NErik Skultety <eskultet@redhat.com>
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