Update haproxy
Update haproxy

Changes:

- https://github.com/docker-library/haproxy/commit/4e917ff: Update to 1.6.15
- https://github.com/docker-library/haproxy/commit/9054c7c: Update to 1.8.22
- https://github.com/docker-library/haproxy/commit/14431e3: Update to 1.7.12
- https://github.com/docker-library/haproxy/commit/bd6b8fd: Update to 1.9.12

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