anchor.diff:  
   define hostgroup {
     hostgroup_name redis
  -  alias redis 
  +  alias redis
   }
   
   define hostgroup {
  
positive.code: 
  define hostgroup {
    hostgroup_name opscode-authz
    alias opscode-authz 
  }
  
  define hostgroup {
  
negative.code: 
  define hostgroup {
    hostgroup_name nginx
    alias nginx
  }
  
  define hostgroup {
    hostgroup_name postgresql
    alias postgresql
  }
  
  define hostgroup {
  