Log to haproxy.log via syslog

- Update Gemfile to use latest berkshelf gem fixing bug to allow use of HTTPS enabled community site.
- Fixed bug in recipes/default where setting httpchk option overwrote the options array with a string.
- Creates a config file in rsyslog.d processing logs from haproxy.

Can we actually always assume that `haproxy_config['defaults']['option']` will have a `push` method on it?