[COOK-3216] Add metadata for attributes in haproxy cookbook
[COOK-3216] Add metadata for attributes in haproxy cookbook

Signed-off-by: Seth Vargo <81550dbf04dfd8537ff7b3c014c6fbf86e0889dc@gmail.com>

bitpusher-real/haproxy,hw-cookbooks/haproxy,Dreeg/haproxy,SocialCentivPublic/haproxy,rightscale-cookbooks-contrib/haproxy,sous-chefs/haproxy,gocardless-cookbooks/haproxy,lmickh/haproxy,gocardless-cookbooks/haproxy,SocialCentivPublic/haproxy,bitpusher-real/haproxy,lmickh/haproxy,rightscale-cookbooks-contrib/haproxy,SocialCentivPublic/haproxy,andrewgoktepe/haproxy,sous-chefs/haproxy,Dreeg/haproxy,rightscale-cookbooks-contrib/haproxy,andrewgoktepe/haproxy,flydata/haproxy,hw-cookbooks/haproxy,bitpusher-real/haproxy,andrewgoktepe/haproxy,lmickh/haproxy,gocardless-cookbooks/haproxy,flydata/haproxy,Dreeg/haproxy