Avoids latency for restore-VMs that are finished fast but not ready
yet the first round while not checking to often for slower ones, iow,
we assume that the start up distribution is looking like a chi-square
Χ² with k=3.
With 25*round we get at max 45 rounds totalling to 25.875 s delay and
1.125 max between-round delay, which still provides an ok reaction
time.
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
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