tests/vm: use console_consume for netbsd

Use new helper to read all pending console output,
not just a single char.  Unblocks installer boot.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-Id: <20191031085306.28888-4-kraxel@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
1 file changed