Fix data races #771
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Fix data races #771
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It's unsafe to copy as is. Closes gocolly#594
rand.Rand is not safe for concurrent use, and go test -race immediately detects the bug.
This is why data race in queue_test.go hasn't been detected on CI.
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Closes #594
Also fixes a data race bug in tests, and enables CI testing of
./queuesub-package which was accidentally left out.