Py2.4: SystemExit in async_wrapper is not an error - compatibility fix

Prior to Python 2.5, SystemExit was a subclass of Exception.
In Py2.4, this is causing extra error output on valid sys.exit(0).

(Toshio) Call sys.exit from inside of the SystemExit exception handler so py2.4 and py2.5+ behaviour matches

lib/ansible/modules/utilities/logic/async_wrapper.py

@@ -199,6 +199,12 @@ if __name__ == '__main__':
                 notice("Module complete (%s)"%os.getpid())
                 sys.exit(0)
 
+    except SystemExit:
+        # On python2.4, SystemExit is a subclass of Exception.
+        # This block makes python2.4 behave the same as python2.5+
+        e = get_exception()
+        sys.exit(e.code)
+
     except Exception:
         e = get_exception()
         notice("error: %s"%(e))