tests: add --network=host backward compatibility test

Add test_network_host_backward_compat to verify that explicit --network=host
still works with the new bridge networking default. Uses busybox httpd with
configurable port since static port forwards now map host_port -> host_port
on VM (for bridge networking's Docker -p handling).

Also update test docstrings to reflect bridge networking as the new default
and add port 8082 to TEST_PORTS for orphan cleanup.

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

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