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.

From [this line](https://github.com/rightscale-cookbooks/rs-haproxy/blob/white_14_08_acu173777_log_to_haproxylog/recipes/default.rb#L77) earlier in the code which sets it as an array, we can.  We can also do some condition checking.