Update haproxy 1.6.15 -> 1.6.16
Update haproxy 1.6.15 -> 1.6.16

This includes a very large number of bug fixes

Signed-off-by: Tim Smith <764ef62106582a09ed09dfa0b6bff7c05fd7d1e4@chef.io>

chef/chef-server,chef/chef-server,chef/chef-server,chef/chef-server,chef/chef-server,chef/chef-server