(MODULES-1582) Improve % detection

Avoids any validate commands that have %'s in them other than "... % ..."

Author: Peter Souter

lib/puppet/parser/functions/validate_cmd.rb

@@ -39,7 +39,7 @@ module Puppet::Parser::Functions
       tmpfile.write(content)
       tmpfile.close
 
-      if checkscript.include?('%')
+      if checkscript =~ /\s%(\s|$)/
         check_with_correct_location = checkscript.gsub(/%/,tmpfile.path)
       else
         check_with_correct_location = "#{checkscript} #{tmpfile.path}"