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Prompted by #901.
This PR significantly speeds up scans by removing sources of event loop blockage, including a severe bug in
dnszonetransfer
that could freeze the scan for upwards of ten seconds.In order to make identifying future asyncio bugs easier, this PR also separates out common function calls into named tasks for easier tracking.
Finally, the number of processes in the process pool has been reduced by 1 in an effort to prevent the process pool for competing with the main python process for CPU.