Update haproxy
Update haproxy

Changes:

- https://github.com/docker-library/haproxy/commit/14a0e31: Merge pull request https://github.com/docker-library/haproxy/pull/88 from TimWolla/2.0-rc
- https://github.com/docker-library/haproxy/commit/47b2abd: Update 2.0-rc to 2.0-dev4
- https://github.com/docker-library/haproxy/commit/2c49aaf: Add USE_GETADDRINFO=1 to build options
- https://github.com/docker-library/haproxy/commit/6e01c91: Add HAProxy 2.0-rc (2.0-dev3)

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