Fix metadata.rb to use OneLogin::RubySaml::Utils.generate as well

Author: subfusc

lib/onelogin/ruby-saml/metadata.rb

@@ -1,7 +1,7 @@
 require "uri"
-require "uuid"
 
 require "onelogin/ruby-saml/logging"
+require "onelogin/ruby-saml/utils"
 
 # Only supports SAML 2.0
 module OneLogin
@@ -50,7 +50,7 @@ def generate(settings, pretty_print=false)
           xc2.text = cert_text
         end
 
-        root.attributes["ID"] = "_" + UUID.new.generate
+        root.attributes["ID"] = OneLogin::RubySaml::Utils.uuid
         if settings.issuer
           root.attributes["entityID"] = settings.issuer
         end