Cleanup helper.h classes#750

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yadij wants to merge 4 commits intosquid-cache:masterfrom

yadij:cvs-1461141

Commits on Nov 15, 2020

Re-apply changes from 017a2d1
yadij
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Add missing wqueue initialization

chtsanti
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yadij
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Improve debug output for helpers I/O
yadij
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Fix rbuf_sz initialization

chtsanti
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yadij
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