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In the host() function, an available port is located,
bound, then released, well before starting the qemu
process. However, during the interval, another process
could easily grab the port, causing an exception to be raised.
Avoid this situation by wrapping both the port search and
qemu process launch, inside a retry loop. If retries are
exceeded, display the error from the qemu process to aid
in debugging.
Signed-off-by: Chris Evich cevich@redhat.com