[COOK-3237] Add node['haproxy']['cookie'] to set a cookie

Signed-off-by: Seth Vargo <sethvargo@gmail.com>
[COOK-3216] Add metadata for attributes in haproxy cookbook

Signed-off-by: Seth Vargo <sethvargo@gmail.com>
[COOK-3211] Add support for RHEL

Signed-off-by: Seth Vargo <sethvargo@gmail.com>
[COOK-3133] configure global stats socket

Signed-off-by: Seth Vargo <sethvargo@gmail.com>
Update CHANGELOG format
Fix whitespace
Version bump to v1.4.0
Bump devodd release
Add provider for listen instructions
Make lb provider more generic

- merge app_lb and default template
- make lb provider handle front/back end
Update Readme to give lwrp examples
Add tests