Squashed 'deps/io-streams-haproxy/' content from commit 85da30d

git-subtree-dir: deps/io-streams-haproxy
git-subtree-split: 85da30ddf585a88e69949c7262d05867134e54eb
Merge commit '3abee48625a311d04cee67293d7809a24ad4b48e' as 'deps/io-streams-haproxy'