Stream line condition

Author: Himani Anil Deshpande

cookbooks/aws-parallelcluster-environment/libraries/directory_service_utils.rb

@@ -21,10 +21,8 @@ def parse_arn(arn_string)
 def _get_cn_subparam(param)
   tokens = param.split(",") unless param.blank?
   tokens.each do |token|
-    ['cn=', 'CN='].each do |param_search|
-      Chef::Log.info("Token is #{token} and param search is #{param_search} and condition #{token.include? param_search}")
-      return token if token.include? param_search
-    end
+    Chef::Log.info("Token is #{token}  and condition #{token.downcase.start_with? "cn="}")
+    return token if token.downcase.start_with? "cn"
   end
   ""
 end