Update haproxy
Update haproxy

Changes:

- https://github.com/docker-library/haproxy/commit/f70bee4: Update 2.5 to 2.5.5
- https://github.com/docker-library/haproxy/commit/f775683: Update 2.4 to 2.4.15
- https://github.com/docker-library/haproxy/commit/b429a6f: Update 2.3 to 2.3.19
- https://github.com/docker-library/haproxy/commit/f727591: Update 2.2 to 2.2.22
- https://github.com/docker-library/haproxy/commit/a421e7e: Update 2.0 to 2.0.28
- https://github.com/docker-library/haproxy/commit/6005935: Update 2.6-rc to 2.6-dev3

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