Derive security_commands from object base class

Author: Brett Hazen

commands.py

@@ -153,7 +153,7 @@ def _btype_command(self, *args):
         return cmd
 
 
-class security_commands:
+class security_commands(object):
     def check_security_command(self, *args):
         cmd = self._security_command(*args)
         return self.check_output(cmd)