qrap: Add probe retry on connection reset from passt for KubeVirt integration

KubeVirt uses libvirt to start qrap in its current draft integration
(https://github.com/kubevirt/kubevirt/pull/7849/), and libvirtd
starts qrap three times every time a new virtual machine is created:
once on domain creation, and twice on domain start (for "probing")
and to finally start it for real.

Very often, a subsequent invocation of qrap happen before the
previously running instance of qemu terminates, which means that
passt will refuse the new connection as the old one is still active.

Introduce a single retry with a 100ms delay to work around this. This
should be checked again once native libvirt support is there, and
that point qrap will have no reason to exist anymore.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

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