Let the user specify username/password

modules/exploits/multi/http/atutor_sqli.rb

@@ -45,8 +45,8 @@ class Metasploit3 < Msf::Exploit::Remote
     register_options(
       [
         OptString.new('TARGETURI', [true, 'The path of Atutor', '/ATutor/']),
-        OptString.new('USERNAME', [true, 'The username to authenticate as', 'test']),
-        OptString.new('PASSWORD', [true, 'The password to authenticate with', 'Password123'])
+        OptString.new('USERNAME', [true, 'The username to authenticate as']),
+        OptString.new('PASSWORD', [true, 'The password to authenticate with'])
       ],self.class)
   end