Build haproxy package

• debian/rules clean
• git-buildpackage -i -us -uc -b

Upstream update

• debian/rules clean
• git-import-orig path/to/haproxy_1.5.x.orig.tar.gz
• dch -v '1:1.5.x-1' -M -D unstable 'Upstream release haproxy 1.5.x'
• git add .
• git commit -m 'Upstream release haproxy 1.5.x'
• git tag 1.5.x-1